ubuntu-cve-2026-55584
Vulnerability from osv_ubuntu
Published
2026-08-28 20:18
Modified
2026-09-02 16:20
Summary
Details
phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSI_ALLOWED access-control check in read_config.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address in one of these headers to impersonate a trusted client and access exposed hostname, kernel, CPU, memory, filesystem, and network-interface information. This issue is fixed in version 3.4.6.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "phpsysinfo",
"binary_version": "3.2.1-1ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "phpsysinfo",
"purl": "pkg:deb/ubuntu/phpsysinfo@3.2.1-1ubuntu3?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.17-1ubuntu1",
"3.2.1-1ubuntu1",
"3.2.1-1ubuntu2",
"3.2.1-1ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "phpsysinfo",
"binary_version": "3.2.5-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "phpsysinfo",
"purl": "pkg:deb/ubuntu/phpsysinfo@3.2.5-3ubuntu1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2.5-3ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "phpsysinfo",
"binary_version": "3.2.5-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "phpsysinfo",
"purl": "pkg:deb/ubuntu/phpsysinfo@3.2.5-3ubuntu1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2.5-3ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "phpsysinfo",
"binary_version": "3.2.5-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "phpsysinfo",
"purl": "pkg:deb/ubuntu/phpsysinfo@3.2.5-3ubuntu1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2.5-3ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "phpsysinfo",
"binary_version": "3.4.3-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "phpsysinfo",
"purl": "pkg:deb/ubuntu/phpsysinfo@3.4.3-3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.4.3-1",
"3.4.3-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "phpsysinfo",
"binary_version": "3.4.4-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "phpsysinfo",
"purl": "pkg:deb/ubuntu/phpsysinfo@3.4.4-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.4.4-1"
]
}
],
"aliases": [],
"details": "phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSI_ALLOWED access-control check in read_config.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address in one of these headers to impersonate a trusted client and access exposed hostname, kernel, CPU, memory, filesystem, and network-interface information. This issue is fixed in version 3.4.6.",
"id": "UBUNTU-CVE-2026-55584",
"modified": "2026-09-02T16:20:01Z",
"published": "2026-08-28T20:18:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55584"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55584"
},
{
"type": "REPORT",
"url": "https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh"
},
{
"type": "REPORT",
"url": "https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab"
},
{
"type": "REPORT",
"url": "https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab"
},
{
"type": "REPORT",
"url": "https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-55584"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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