PT-2026-42749 · Mattermost · Mattermost

Thecybertantrik · CVE-2026-5308 · Published 2026-05-22 · Updated 2026-07-07

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Mattermost version 11.6.0 Mattermost version 11.5.3 Mattermost version 11.4.4 Mattermost version 10.11.14

Description Failure to enforce request body size limits on plugin HTTP endpoints allows an attacker to cause a denial of service by sending crafted oversized HTTP requests.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

BDU:2026-07536

CVE-2026-5308

GHSA-JMVR-R5HM-FXFR

GO-2026-5836

Affected Products

Mattermost

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5308.json · Exploit
• https://bdu.fstec.ru/vul/2026-07536 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-5836 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-jmvr-r5hm-fxfr · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-5308 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5308 · Security Note
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost-plugin-github/commit/9b41b1fd43c408f4be53026ee337bbeaa74ad47c · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-5308 · Note
• https://t.me/CVEtracker/54621 · Telegram Post
• https://github.com/advisories/GHSA-jmvr-r5hm-fxfr · Note