EUVD-2026-77361
GHSA-rx7r-2mx7-mxq9
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Network upload vector; low complexity; requires authenticated user with default file upload permission; availability impact limited to indexing subsystem only.
Primary rating from Vendor (Mattermost).
CVSS VectorVendor: Mattermost
Lifecycle Timeline
1DescriptionCVE.org
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to properly enforce the limit of concurrent files being processed and handled failed files, which allows a user with permission to upload files to spawn more goroutines than intended and block the indexing of other files via uploading heavy files constantly to the server.. Mattermost Advisory ID: MMSA-2026-00696
AnalysisAI
Resource exhaustion in Mattermost's file processing pipeline allows any authenticated user with file upload permissions to spawn unbounded goroutines by continuously uploading large files, degrading or blocking the file indexing service for all other users. Affected versions span the 10.11.x, 11.7.x, 11.8.x, and 11.9.x release trains. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an active, authenticated Mattermost user account with file upload permissions enabled for their role - a non-elevated permission granted by default to standard workspace members. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 3.1 score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) accurately reflects a medium-low, bounded DoS. … 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 | Apply the vendor-released patches documented at https://mattermost.com/security-updates (MMSA-2026-00696). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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