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CVE Vulnerability Details :

CVE-2025-55074

PUBLISHED

More Info Official Page

Assigner-Mattermost

Assigner Org ID-9302f53e-dde5-4bf3-b2f2-a83f91ac0eee

Published At-18 Nov, 2025 | 15:23

Updated At-18 Nov, 2025 | 21:03

▼CVE Numbering Authority (CNA)

Channel member objects leak read status

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects

Affected Products

Vendor

Mattermost, Inc.

Product

Mattermost

Default Status

unaffected

Versions

Affected

From 10.11.0 through 10.11.3 (semver)
From 10.5.0 through 10.5.11 (semver)

Unaffected

11.0.0
10.11.4
10.5.12

Problem Types

Type	CWE ID	Description
CWE	CWE-1426	CWE-1426: Improper Validation of Generative AI Output

Type: CWE

CWE ID: CWE-1426

Description: CWE-1426: Improper Validation of Generative AI Output

Metrics

Version	Base score	Base severity	Vector
3.1	3.0	LOW	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

Version: 3.1

Base score: 3.0

Base severity: LOW

Vector:

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

Solutions

Update Mattermost to versions 11.0.0, 10.11.4, 10.5.12 or higher.

Credits

finder

Juho Forsén

References

Hyperlink	Resource
https://mattermost.com/security-updates	N/A

Hyperlink: https://mattermost.com/security-updates

Resource: N/A

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

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Affected

Unaffected

Problem Types

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Metrics Other Info

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Credits

Timeline

Replaced By

Rejected Reason

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Affected Products

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References