What’s Vulnerable › Vulnerabilities
CVE-2025-0503: Leaked User IDs and Metadata of Deleted DMs
- Severity: medium (CVSS 5.3 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: 2025-02-14 · updated 2026-06-17
- Weakness: CWE-754
Description
Mattermost versions 9.11.x <= 9.11.6 fail to filter out DMs from the deleted channels endpoint which allows an attacker to infer user IDs and other metadata from deleted DMs if someone had manually marked DMs as deleted in the database.
Affected products
- Mattermost: from 9.11.0 before 9.11.7 — fixed in 9.11.7
How to fix
Upgrade to a fixed version: Mattermost 9.11.7. Check the vendor advisory for mitigations.
References
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