CVE-2025-55073

Name: CVE-2025-55073
Creator: NVD / NIST
Published: 2025-11-14T08:15:45.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2025-55073 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.16%

5.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 10.5.0, < 10.5.12
Mattermost	Mattermost Server	>= 10.11.0, < 10.11.4
Mattermost	Mattermost Server	>= 10.12.0, < 10.12.1

References

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

Timeline

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

Frequently Asked Questions

What is CVE-2025-55073?

How severe is CVE-2025-55073?

CVE-2025-55073 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2025-55073?

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-2025-55073?

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

Scan your code now

Source: NVD / NIST