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High, CVSS 7.6

Mattermost Open Redirect vulnerability

CVE-2025-9072GHSA-69j8-prx2-vx98

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/mattermost/mattermost/server/v8 8.0.0-20250731063404-9eebaadf8f72; github.com/mattermost/mattermost-server 10.10.2, 10.9.5, 10.5.10), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-69j8-prx2-vx98 lists affected ranges: Go github.com/mattermost/mattermost-server >=10.10.0 =10.5.0 =10.9.0 =0 <8.0.0-20250731063404-9eebaadf8f72

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.6 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
EPSS
  • CVE-2025-9072: 0.18% estimated exploitation activity in the next 30 days; percentile 7.18 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirectto parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-69j8-prx2-vx98

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-9072

Advisory: Mattermost Open Redirect vulnerability
IDs: CVE-2025-9072, GHSA-69j8-prx2-vx98
Record: https://patchnext.com/advisories/cve-2025-9072 (revision 1, source checked 26 Oct 2026, 15:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/mattermost/mattermost/server/v8 8.0.0-20250731063404-9eebaadf8f72; github.com/mattermost/mattermost-server 10.10.2, 10.9.5, 10.5.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/mattermost/mattermost/server/v8: affected < 8.0.0-20250731063404-9eebaadf8f72; fixed in 8.0.0-20250731063404-9eebaadf8f72
- Go github.com/mattermost/mattermost-server: affected >= 10.10.0, < 10.10.2; >= 10.5.0, < 10.5.10; >= 10.9.0, < 10.9.5; fixed in 10.10.2, 10.5.10, 10.9.5

## Suggested inspection (read-only)
- Go github.com/mattermost/mattermost/server/v8: check the installed version with your package manager.
- Go github.com/mattermost/mattermost-server: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-69j8-prx2-vx98 (GitHub-reviewed advisory GHSA-69j8-prx2-vx98 lists affected ranges: Go github.com/mattermost/mattermost-server >=10.10.0 =10.5.0 =10.9.0 =0 <8.0.0-20250731063404-9eebaadf8f72)

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