PT-2026-42745 · Mattermost · Mattermost

Eahmed · CVE-2026-3473 · Published 2026-05-22 · Updated 2026-07-07

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:S/C:C/I:P/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 Improper validation of file ownership and access control in the Boards API allows an authenticated user to access and download files belonging to other users or teams. This is achieved by sending crafted requests to the Boards API using valid file IDs.

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

Exploit

DoS

IDOR

Weakness Enumeration

CWE-639

Related Identifiers

BDU:2026-07548

CVE-2026-3473

GHSA-7PF2-9C95-W332

GO-2026-5817

Affected Products

Mattermost

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3473.json · Exploit
• https://bdu.fstec.ru/vul/2026-07548 · Security Note
• https://osv.dev/vulnerability/CVE-2026-3473 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3473 · Security Note
• https://osv.dev/vulnerability/GHSA-7pf2-9c95-w332 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-5817 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://t.me/CVEtracker/54625 · Telegram Post
• https://feedly.com/cve/CVE-2026-3473 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-3473 · Note
• https://app.opencve.io/cve/CVE-2026-3473 · Note
• https://github.com/advisories/GHSA-7pf2-9c95-w332 · Note