EUVD-2026-77359
GHSA-j89q-r2jw-jrj5
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Requires authenticated non-guest access (PR:L) over network; only outcome is unauthorized board creation (I:L) with no confidentiality or availability impact.
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 enforce board creation permissions when importing archive files which allows an authenticated non-guest team member to create Open or Private boards despite administrator restrictions via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00712
AnalysisAI
Permission enforcement failure in Mattermost Boards allows authenticated non-guest team members to create Open or Private boards in defiance of administrator-imposed restrictions by importing a crafted .boardarchive file. The import code path omits the authorization check enforced by the direct board creation pathway, making administrative board creation controls bypassable by any authenticated non-guest user with import access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid Mattermost account at non-guest team member level - guest accounts cannot exploit this. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned and NVD-confirmed CVSS 3.1 score of 4.3 (Medium) with vector AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N accurately captures the constrained impact: network-reachable, low complexity, but requiring authenticated non-guest access (PR:L), with only low integrity impact and no confidentiality or availability consequences. … 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 to a patched release per the Mattermost security advisory MMSA-2026-00712 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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