PT-2026-25712 · Mattermost · Mattermost

Juho Forsén · CVE-2026-25780 · Published 2026-02-13 · Updated 2026-07-30

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.10 Mattermost versions 11.2.0 through 11.2.2 Mattermost versions 11.3.0

Description Mattermost does not properly limit memory allocation when processing DOC files. This allows an authenticated attacker to exhaust server memory and cause a denial of service by uploading a specially crafted DOC file.

Recommendations Update Mattermost to a version later than 10.11.10. Update Mattermost to a version later than 11.2.2. Update Mattermost to a version later than 11.3.0.

Exploit

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-789

Related Identifiers

BDU:2026-06562

CVE-2026-25780

GHSA-XV2P-WCHJ-QJHP

GO-2026-4733

OPENSUSE-SU-2026:21483-1

SUSE-SU-2026:1135-1

Affected Products

Mattermost

References · 1749

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25780.json · Exploit
• https://bdu.fstec.ru/vul/2026-06562 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25780 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-25780 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4733 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-xv2p-wchj-qjhp · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:21483-1 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost/commit/86797c508c444e299b20889ce241fde505a402cc · Note
• https://suse.com/security/cve/CVE-2025-65797 · Note
• https://suse.com/security/cve/CVE-2026-44427 · Note
• https://suse.com/security/cve/CVE-2026-27589 · Note
• https://suse.com/security/cve/CVE-2026-7736 · Note