CVE-2026-9699

mediumCVSS 6.8covered by 1 sourcefirst seen 2026-06-26

Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries generated during authentication failures. Mattermost Advisory ID: MMSA-2026-00609

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Exploitation outlook

Low exploitation risk0.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-9699: Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses fr…nvd · 2026-06-26

External references

NVD record for CVE-2026-9699

CVE.org record

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