CVE-2026-0300 (GCVE-0-2026-0300)
Vulnerability from cvelistv5 – Published: 2026-05-06 18:57 – Updated: 2026-05-06 22:20
VLAI?
CISA KEV
Title
PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
Summary
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses.
Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
Severity ?
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
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Impacted products
| Vendor | Product | Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Palo Alto Networks | Cloud NGFW |
Unaffected:
All
(custom)
|
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|
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Date Public ?
2026-05-05 23:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 528df847-2140-4049-8a49-1cf9f2ccf428
Exploited: Yes
Timestamps
First Seen: 2026-05-06
Asserted: 2026-05-06
Scope
Notes: KEV entry: Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability | Affected: Palo Alto Networks / PAN-OS | Description: Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. | Due date: 2026-05-09 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-787 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | PAN-OS |
| Due Date | 2026-05-09 |
| Date Added | 2026-05-06 |
| Vendorproject | Palo Alto Networks |
| Vulnerabilityname | Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-05-06 19:00 UTC
| Updated: 2026-05-06 19:00 UTC
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"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"exploitMaturity": "ATTACKED",
"privilegesRequired": "NONE",
"providerUrgency": "RED",
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"providerMetadata": {
"dateUpdated": "2026-05-06T22:09:48.796Z",
"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
"shortName": "palo_alto"
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"url": "https://security.paloaltonetworks.com/CVE-2026-0300"
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"value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\u003cbr\u003e\u003cbr\u003eWe strongly recommend that you secure access to your User-ID\u2122 Authentication Portal following the instructions in the workarounds section below."
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"source": {
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"value": "Updated with Threat Prevention ID and clarified the Required Configuration section."
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{
"lang": "en",
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"title": "PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID\u2122 Authentication Portal",
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"value": "Customers can mitigate the risk of this issue by taking either of the following actions:\n\n * Restrict User-ID\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users\u0027 browsers ingress. Refer to Step 6 of the following Live Community article (https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286) and Knowledgebase article (https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC) for steps to restrict access.\n \n * Disable User-ID\u2122 Authentication Portal if not required.\n \n\nCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support."
}
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"dateReserved": "2025-11-03T20:44:58.173Z",
"dateUpdated": "2026-05-06T22:20:23.569Z",
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"cwes": "[\"CWE-787\"]",
"dateAdded": "2026-05-06",
"dueDate": "2026-05-09",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300",
"product": "PAN-OS",
"requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required.",
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11.2.4-h17\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"11.1.15\", \"status\": \"unaffected\"}, {\"at\": \"11.1.13-h5\", \"status\": \"unaffected\"}, {\"at\": \"11.1.10-h25\", \"status\": \"unaffected\"}, {\"at\": \"11.1.7-h6\", \"status\": \"unaffected\"}, {\"at\": \"11.1.6-h32\", \"status\": \"unaffected\"}, {\"at\": \"11.1.4-h33\", \"status\": \"unaffected\"}], \"version\": \"11.1.0\", \"lessThan\": \"11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"10.2.18-h6\", \"status\": \"unaffected\"}, {\"at\": \"10.2.16-h7\", \"status\": \"unaffected\"}, {\"at\": \"10.2.13-h21\", \"status\": \"unaffected\"}, {\"at\": \"10.2.10-h36\", \"status\": \"unaffected\"}, {\"at\": \"10.2.7-h34\", \"status\": \"unaffected\"}], \"version\": \"10.2.0\", \"lessThan\": \"10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Palo Alto Networks\", \"product\": \"Prisma Access\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"All\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Limited exploitation has been observed targeting Palo Alto Networks User-ID\\u2122 Authentication Portals that are exposed to untrusted IP addresses and/or the public internet. Customers following standard security best practices, such as restricting sensitive portals to trusted internal networks are at a greatly reduced risk.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Limited exploitation has been observed targeting Palo Alto Networks User-ID\\u2122 Authentication Portals that are exposed to untrusted IP addresses and/or the public internet. Customers following standard security best practices, such as restricting sensitive portals to trusted internal networks are at a greatly reduced risk.\", \"base64\": false}]}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-06T17:27:00.000Z\", \"value\": \"Updated with Threat Prevention ID and clarified the Required Configuration section.\"}, {\"lang\": \"en\", \"time\": \"2026-05-05T23:00:00.000Z\", \"value\": \"Initial publication.\"}], \"solutions\": [{\"lang\": \"eng\", \"value\": \"This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\\n\\nWe strongly recommend that you secure access to your User-ID\\u2122 Authentication Portal following the instructions in the workarounds section below.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\u003cbr\u003e\u003cbr\u003eWe strongly recommend that you secure access to your User-ID\\u2122 Authentication Portal following the instructions in the workarounds section below.\", \"base64\": false}]}], \"datePublic\": \"2026-05-05T23:00:00.000Z\", \"references\": [{\"url\": \"https://security.paloaltonetworks.com/CVE-2026-0300\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"eng\", \"value\": \"Customers can mitigate the risk of this issue by taking either of the following actions:\\n * Restrict User-ID\\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users\u0027 browsers ingress. Refer to Step 6 of the following Live Community article https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286 and Knowledgebase article https://knowledgebase.paloaltonetworks.com/KCSArticleDetail for steps to restrict access.\\n\\n * Disable User-ID\\u2122 Authentication Portal if not required.\\n\\n\\n\\nCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID\\u00a0510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Customers can mitigate the risk of this issue by taking either of the following actions:\u003cbr\u003e\u003cul\u003e\u003cli\u003eRestrict User-ID\\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users\u0027 browsers ingress. Refer to Step 6 of the following \u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286\\\"\u003eLive Community article\u003c/a\u003e and \u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC\\\"\u003eKnowledgebase article\u003c/a\u003e for steps to restrict access.\u003cbr\u003e\u003c/li\u003e\u003cli\u003eDisable User-ID\\u2122 Authentication Portal if not required.\u003cbr\u003e\u003c/li\u003e\u003c/ul\u003eCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID\u0026nbsp;510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support.\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A buffer overflow vulnerability in the User-ID\\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. \\n\\nThe risk of this issue is greatly reduced if you secure access to the User-ID\\u2122 Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses.\\n\\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eA buffer overflow vulnerability in the User-ID\\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. \u003cbr\u003e\u003cbr\u003eThe risk of this issue is greatly reduced if you secure access to the User-ID\\u2122 Authentication Portal per the \u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC\\\"\u003ebest practice guidelines\u003c/a\u003e by restricting access to only trusted internal IP addresses.\u003cbr\u003e\u003cbr\u003ePrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability. \u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787: Out-of-bounds Write\"}]}], \"configurations\": [{\"lang\": \"eng\", \"value\": \"This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID\\u2122 Authentication Portal.\\n\\nCustomers are impacted if both of the following conditions are true:\\n\\n\\n * User-ID\\u2122 Authentication Portal configured in the User-ID\\u2122 Authentication Portal Settings page. You can verify the configuration by going to Device \u003e User Identification \u003e Authentication Portal Settings -\u003e Enable Authentication Portal (applies to both transparent and redirect modes) and\\n * An interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network \u003e Interface \u003e Select the interface \u003e Advanced Tab \u003e Create Management Interface Profile.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThis issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID\\u2122 Authentication Portal.\u003cbr\u003e\u003cbr\u003eCustomers are impacted if both of the following conditions are true:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eUser-ID\\u2122 Authentication Portal configured in the User-ID\\u2122 Authentication Portal Settings page. You can verify the configuration by going to Device \u0026gt; User Identification \u0026gt; Authentication Portal Settings -\u0026gt; Enable Authentication Portal (applies to both transparent and redirect modes) \u003cb\u003eand\u003c/b\u003e\u003c/li\u003e\u003cli\u003eAn interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network \u0026gt; Interface \u0026gt; Select the interface \u0026gt; Advanced Tab \u0026gt; Create Management Interface Profile.\u003cbr\u003e\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:palo_alto_networks:cloud_ngfw:all:*:*:*:*:*:*:*\", \"vulnerable\": false}], \"operator\": \"OR\"}, {\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"12.1.7_12.1.4-h5\", \"versionStartIncluding\": \"12.1.0\"}, {\"criteria\": \"cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"11.2.12_11.2.10-h6_11.2.7-h13_11.2.4-h17\", \"versionStartIncluding\": \"11.2.0\"}, {\"criteria\": \"cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"11.1.15_11.1.13-h5_11.1.10-h25_11.1.7-h6_11.1.6-h32_11.1.4-h33\", \"versionStartIncluding\": \"11.1.0\"}, {\"criteria\": \"cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"10.2.18-h6_10.2.16-h7_10.2.13-h21_10.2.10-h36_10.2.7-h34\", \"versionStartIncluding\": \"10.2.0\"}], \"operator\": \"OR\"}, {\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:palo_alto_networks:prisma_access:all:*:*:*:*:*:*:*\", \"vulnerable\": false}], \"operator\": \"OR\"}], \"operator\": \"OR\"}], \"providerMetadata\": {\"orgId\": \"d6c1279f-00f6-4ef7-9217-f89ffe703ec0\", \"shortName\": \"palo_alto\", \"dateUpdated\": \"2026-05-06T19:24:13.881Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-0300\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-06T19:24:13.881Z\", \"dateReserved\": \"2025-11-03T20:44:58.173Z\", \"assignerOrgId\": \"d6c1279f-00f6-4ef7-9217-f89ffe703ec0\", \"datePublished\": \"2026-05-06T18:57:39.876Z\", \"assignerShortName\": \"palo_alto\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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