PT-2026-41658 · Mattermost · Mattermost

0X7Oda7123 · Published 2026-05-18 · Updated 2026-05-18 · CVE-2026-6343

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 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 issue exists where public/private permissions are not properly verified, allowing members who lack these permissions to access public playbooks through the '/get' endpoint.

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 '/get' endpoint to minimize the risk of unauthorized playbook access.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-6343

Affected Products

Mattermost

References · 5

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6343 · Security Note
• https://t.me/CVEtracker/54118 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2056343351029321915 · Twitter Post
• https://twitter.com/CVEarity/status/2056410002852893033 · Twitter Post