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CVE-2025-14350

Information disclosure via channel mentions in posts

MEDIUM
4.3
CVSS Score
Published: February 16, 2026 at 12:05 PM UTC
Updated: June 17, 2026 at 08:35 AM UTC
2 products affected across 1 vendorMattermost ServerMattermost

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost Server· Mattermost
95%
10.11.0 ≤ v < 10.11.1011.1.0 ≤ v < 11.1.311.2.0 ≤ v < 11.2.2
Mattermost· Mattermost
60%
10.11.0 ≤ v ≤ 10.11.911.1.0 ≤ v ≤ 11.1.211.2.0 ≤ v ≤ 11.2.110.11.011.1.011.2.0
Vendor states this is fixed in 10.11.10 (unaffected)
Vendor states this is fixed in 11.1.3 (unaffected)
Vendor states this is fixed in 11.2.2 (unaffected)
Vendor states this is fixed in 11.3.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-862

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