EUVD-2026-60210
GHSA-cgr5-gh7v-f893
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
PR:L reflects the required delegated OAuth token; I:L added because revoking account authorizations modifies account state, not just availability.
Primary rating from Vendor (mattermost).
CVSS VectorVendor: mattermost
Lifecycle Timeline
1DescriptionCVE.org
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 Mattermost failed to restrict OAuth deauthorization and personal access token management endpoints to direct user sessions, which allowed an OAuth app with a delegated user token to revoke the user's authorizations or tokens for other integrations via account-management endpoints.. Mattermost Advisory ID: MMSA-2026-00704
AnalysisAI
Incorrect authorization in Mattermost's OAuth and personal access token management endpoints allows an OAuth application holding a delegated user token to call account-management endpoints beyond its intended scope, revoking the victim user's authorizations or tokens for unrelated integrations. Affected are Mattermost 11.7.0 through 11.7.6 and 10.11.0 through 10.11.21. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker controls an OAuth application that has been authorized by the target user, giving the app a valid delegated user token for that user's Mattermost account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS score of 4.3 (Medium) reflects a genuinely moderate risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to upgrade to a patched Mattermost release per the vendor's security update page at https://mattermost.com/security-updates. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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