CVE-2024-10241: Private channel names leaked with Ctrl+K when ElasticSearch is enabled

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-29 · updated 2026-06-17
Weakness: CWE-284

Description

Mattermost versions 9.5.x <= 9.5.9 fail to properly filter the channel data when ElasticSearch is enabled which allows a user to get private channel names by using cmd+K/ctrl+K.

Affected products

Mattermost: from 9.5.0 before 9.5.10 — fixed in 9.5.10

How to fix

Upgrade to a fixed version: Mattermost 9.5.10. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

Get alerted when CVE-2024-10241 or the next vulnerability affects your stack