What is CVE-2026-4053?

CVE-2026-4053 is a low-severity vulnerability in Mattermost, classified under Operation on a Resource after Expiration or Release. CVSS score: 3.1/10. Published 2026-05-15.

How severe is CVE-2026-4053?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in Mattermost

CVE-2026-4053

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has…

EPSS: 0.001 (21.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Mattermost — versions 11.5.0, 10.11.0, 11.6.0
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-672 — Operation on a Resource after Expiration or Release

References

responsibledisclosure@mattermost.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-4053?: CVE-2026-4053 is a low-severity vulnerability in Mattermost, classified under Operation on a Resource after Expiration or Release. CVSS score: 3.1/10. Published 2026-05-15.
How severe is CVE-2026-4053?: Low severity. CVSS v3 base score is 3.1 out of 10.