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Mattermost has missing redirect URL validation

Low severity GitHub Reviewed Published Dec 17, 2025 to the GitHub Advisory Database • Updated Dec 18, 2025

Package

gomod github.com/mattermost/mattermost (Go)

Affected versions

>= 10.11.0-rc1, < 10.11.5-0.20251016131338-dad6bd7a1509
>= 11.0.0-alpha.1, < 11.1.0

Patched versions

10.11.5-0.20251016131338-dad6bd7a1509
11.1.0
gomod github.com/mattermost/mattermost/server/v8 (Go)
>= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20251016131338-dad6bd7a1509
8.0.0-20251016131338-dad6bd7a1509

Description

Mattermost versions 10.11.x <= 10.11.4 fail to validate redirect URLs on the /error page, which allows an attacker to redirect a victim to a malicious site via a crafted link opened in a new tab.

References

Published by the National Vulnerability Database Dec 17, 2025
Published to the GitHub Advisory Database Dec 17, 2025
Reviewed Dec 18, 2025
Last updated Dec 18, 2025

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(7th percentile)

Weaknesses

URL Redirection to Untrusted Site ('Open Redirect')

The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. Learn more on MITRE.

CVE ID

CVE-2025-62690

GHSA ID

GHSA-q66g-q98c-q454

Source code

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