SecuriTricks - CVE-2025-55073

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.

Product(s) Impacted

Vendor	Product	Versions
Mattermost	Mattermost	10.11.0-10.11.3, 10.5.0-10.5.11, 10.12.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-306

Missing Authentication for Critical Function

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	mattermost	mattermost	10.11.0-10.11.3	/	/	/	/	/	/	/
a	mattermost	mattermost	10.5.0-10.5.11	/	/	/	/	/	/	/
a	mattermost	mattermost	10.12.0	/	/	/	/	/	/	/

References

https://mattermost.com/security-updates

CVSS Score

5.4 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: LOW
Availability Impact: LOW

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

View Vector String

Timeline

Published: Nov. 14, 2025, 8:15 a.m.
Last Modified: Nov. 14, 2025, 4:42 p.m.

Status : Undergoing Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

responsibledisclosure@mattermost.com

CVE-2025-55073