EUVD-2026-77376
GHSA-mq74-c6v5-598g
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Editor board access constitutes PR:L; availability impact is limited to the Boards plugin worker (A:L); no confidentiality or integrity impact applies.
Primary rating from Vendor (Mattermost).
CVSS VectorVendor: Mattermost
Lifecycle Timeline
2DescriptionCVE.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 validate the type of fields.properties on block creation which allows an authenticated user with editor access to a board to crash the Boards plugin worker and trigger a denial of service via a child block whose fields.properties is a non-object value. Mattermost Advisory ID: MMSA-2026-00710
AnalysisAI
The Boards plugin in Mattermost fails to validate the data type of fields.properties during block creation, enabling any authenticated user holding editor-level access on a board to crash the Boards plugin worker via a malformed child block. Four release branches are affected (10.11.x, 11.7.x, 11.8.x, 11.9.x). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concrete prerequisites: (1) a valid authenticated Mattermost account on the target instance, and (2) editor-level access to at least one board, which is granted by a board owner or channel administrator. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) accurately reflects the real-world 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 | Upgrade Mattermost to a release beyond the affected version ranges documented in MMSA-2026-00710 at https://mattermost.com/security-updates. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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