CVE-2021-37865

5.7 mediumEPSS 0.9%

Medium (5.7) in mattermost mattermost. EPSS 0.9% chance of exploitation in the next 30 days.

Mattermost 6.2 and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.

Severity

CVSS 3.1

5.7 medium

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

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 59% of CVEs (scores of 2026-10-31)
CWE: CWE-400
Published: 2022-01-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mattermost:mattermost

References

https://hackerone.com/reports/1428260
https://mattermost.com/security-updates/
https://hackerone.com/reports/1428260
https://mattermost.com/security-updates/

Check your stack JSON