CVE-2026-40592 (GCVE-0-2026-40592)
Vulnerability from cvelistv5 – Published: 2026-04-21 16:57 – Updated: 2026-04-21 19:10
VLAI
EPSS
VEX
Title
FreeScout's cross-user undo reply allows mailbox peers to recall another agent's outbound reply
Summary
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the undo-send route `GET /conversation/undo-reply/{thread_id}` checks only whether the current user can view the parent conversation. It does not verify that the current user created the reply being undone. In a shared mailbox, one agent can therefore recall another agent's just-sent reply during the 15-second undo window. Version 1.8.214 fixes the vulnerability.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-21 19:10 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/freescout-help-desk/freescout/… | x_refsource_CONFIRM |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| freescout-help-desk | freescout |
Affected:
< 1.8.214
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-40592",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-21T19:10:27.269388Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-21T19:10:40.989Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "freescout",
"vendor": "freescout-help-desk",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.214"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the undo-send route `GET /conversation/undo-reply/{thread_id}` checks only whether the current user can view the parent conversation. It does not verify that the current user created the reply being undone. In a shared mailbox, one agent can therefore recall another agent\u0027s just-sent reply during the 15-second undo window. Version 1.8.214 fixes the vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862: Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-21T16:57:33.146Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-674v-r6xp-mvp6",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-674v-r6xp-mvp6"
},
{
"name": "https://github.com/freescout-help-desk/freescout/commit/c779afdda86fa00a4b85779e034bbfd9ce20c76d",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/freescout-help-desk/freescout/commit/c779afdda86fa00a4b85779e034bbfd9ce20c76d"
},
{
"name": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214"
}
],
"source": {
"advisory": "GHSA-674v-r6xp-mvp6",
"discovery": "UNKNOWN"
},
"title": "FreeScout\u0027s cross-user undo reply allows mailbox peers to recall another agent\u0027s outbound reply"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-40592",
"datePublished": "2026-04-21T16:57:33.146Z",
"dateReserved": "2026-04-14T14:07:59.641Z",
"dateUpdated": "2026-04-21T19:10:40.989Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-40592",
"date": "2026-09-15",
"epss": "0.00238",
"percentile": "0.14914"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-40592\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-04-21T17:16:57.087\",\"lastModified\":\"2026-06-17T10:45:30.090\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the undo-send route `GET /conversation/undo-reply/{thread_id}` checks only whether the current user can view the parent conversation. It does not verify that the current user created the reply being undone. In a shared mailbox, one agent can therefore recall another agent\u0027s just-sent reply during the 15-second undo window. Version 1.8.214 fixes the vulnerability.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"freescout-help-desk\",\"product\":\"freescout\",\"versions\":[{\"version\":\"\u003c 1.8.214\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":1.6,\"impactScore\":4.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-04-21T19:10:27.269388Z\",\"id\":\"CVE-2026-40592\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"}]}],\"references\":[{\"url\":\"https://github.com/freescout-help-desk/freescout/commit/c779afdda86fa00a4b85779e034bbfd9ce20c76d\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-674v-r6xp-mvp6\",\"source\":\"security-advisories@github.com\"}]}}",
"redhat_vex": {
"current_release_date": "2026-06-05T19:27:04+00:00",
"cve": "CVE-2026-40592",
"id": "CVE-2026-40592",
"initial_release_date": "2026-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "FreeScout\u0027s cross-user undo reply allows mailbox peers to recall another agent\u0027s outbound reply",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40592.json",
"version": "3"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-40592\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-21T19:10:27.269388Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-21T19:10:36.577Z\"}}], \"cna\": {\"title\": \"FreeScout\u0027s cross-user undo reply allows mailbox peers to recall another agent\u0027s outbound reply\", \"source\": {\"advisory\": \"GHSA-674v-r6xp-mvp6\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"freescout-help-desk\", \"product\": \"freescout\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.8.214\"}]}], \"references\": [{\"url\": \"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-674v-r6xp-mvp6\", \"name\": \"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-674v-r6xp-mvp6\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/freescout-help-desk/freescout/commit/c779afdda86fa00a4b85779e034bbfd9ce20c76d\", \"name\": \"https://github.com/freescout-help-desk/freescout/commit/c779afdda86fa00a4b85779e034bbfd9ce20c76d\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214\", \"name\": \"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the undo-send route `GET /conversation/undo-reply/{thread_id}` checks only whether the current user can view the parent conversation. It does not verify that the current user created the reply being undone. In a shared mailbox, one agent can therefore recall another agent\u0027s just-sent reply during the 15-second undo window. Version 1.8.214 fixes the vulnerability.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-862\", \"description\": \"CWE-862: Missing Authorization\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-04-21T16:57:33.146Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-40592\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-21T19:10:40.989Z\", \"dateReserved\": \"2026-04-14T14:07:59.641Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-21T16:57:33.146Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…