PT-2026-42746 · Mattermost · Mattermost

Runup · Published 2026-05-22 · Updated 2026-07-07 · CVE-2026-3636

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

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 Insufficient sanitization of team member data returned via API endpoints allows users without elevated permissions to obtain unauthorized information regarding the roles of team members.

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

Exploit

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

BDU:2026-09002

CVE-2026-3636

GHSA-FFPR-PFR4-G354

GO-2026-5818

Affected Products

Mattermost

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3636.json · Exploit
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-5818 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-09002 · Security Note
• https://osv.dev/vulnerability/GHSA-ffpr-pfr4-g354 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3636 · Security Note
• https://osv.dev/vulnerability/CVE-2026-3636 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-3636 · Note
• https://t.me/CVEtracker/54623 · Telegram Post
• https://github.com/advisories/GHSA-ffpr-pfr4-g354 · Note