PT-2026-41639 · Mattermost · Mattermost

Lorenzo Gallegos · CVE-2026-2325 · Published 2026-05-18 · Updated 2026-06-25

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.5.0 through 11.5.1 Mattermost versions 10.11.0 through 10.11.13 Mattermost versions 11.4.0 through 11.4.3

Description An authenticated attacker can cause resource exhaustion or denial of service by sending a crafted oversized HTTP POST request to the ' /api/v1/meetings' endpoint. This occurs because the application fails to limit the size of the request body.

Recommendations Update Mattermost versions 11.5.0 through 11.5.1 to a version newer than 11.5.1. Update Mattermost versions 10.11.0 through 10.11.13 to a version newer than 10.11.13. Update Mattermost versions 11.4.0 through 11.4.3 to a version newer than 11.4.3. As a temporary workaround, restrict access to the ' /api/v1/meetings' endpoint to minimize the risk of exploitation.

Exploit

Fix

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-2325

GHSA-M3P3-8FRQ-Q7QH

GO-2026-5489

Affected Products

Mattermost

References · 10

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2325.json · Exploit
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-m3p3-8frq-q7qh · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-5489 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-2325 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2325 · Security Note
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost-plugin-msteams-meetings/commit/c5892dd169de865504afa2dd02eaeb6287489f7f · Note
• https://github.com/advisories/GHSA-m3p3-8frq-q7qh · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2325 · Note