CVE-2025-0503

Name: CVE-2025-0503
Creator: NVD / NIST
Published: 2025-02-14T18:15:23.87+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2025-0503 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.23%

14.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-754

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 9.11.0, < 9.11.7

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Feb 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-0503?

How severe is CVE-2025-0503?

CVE-2025-0503 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2025-0503?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-0503?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST