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CVE-2025-3611

Improper Access Control in Mattermost allows System Managers to view team details despite role restrictions

MEDIUM
4.3
CVSS Score
Published: May 30, 2025 at 02:22 PM UTC
Updated: June 17, 2026 at 09:20 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 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly enforce access control restrictions for System Manager roles, allowing authenticated users with System Manager privileges to view team details they should not have access to via direct API requests to team endpoints, even when explicitly configured with 'No access' to Teams in the System Console.

Affected

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

Mattermost Server· Mattermost
95%
10.5.0 ≤ v < 10.5.49.11.0 ≤ v < 9.11.1310.7.010.7.0 rc110.7.0 rc2
Affected range stops below 10.5.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.11.13, so it looks safe — our inference, not a vendor statement
Mattermost· Mattermost
60%
10.5.0 ≤ v ≤ 10.5.39.11.0 ≤ v ≤ 9.11.1210.5.010.7.09.11.0
Vendor states this is fixed in 10.5.4 (unaffected)
Vendor states this is fixed in 10.7.1 (unaffected)
Vendor states this is fixed in 10.8.0 (unaffected)
Vendor states this is fixed in 9.11.13 (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: [email protected]
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

4.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-863

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