CVE-2026-3524

8.8 highEPSS 0.4%

High (8.8) in mattermost legal hold. EPSS 0.4% chance of exploitation in the next 30 days.

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
CWE: CWE-862
Published: 2026-04-06
Modified: 2026-08-06
Record from: the NVD, synced 2026-10-19

Affected

mattermost:legal_hold

References

https://mattermost.com/security-updates

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