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MEDIUM severity

Mattermost fails to sanitize post metadataGHSA-9rww-66w7-7vjx

MEDIUM

GHSA-9rww-66w7-7vjx is a medium-severity (CVSS 4.5) CWE-532 vulnerability in github.com/mattermost/mattermost-server/v6. A fix is available for github.com/mattermost/mattermost-server/v6 — see the affected versions and patch details below.

Also known asCVE-2023-4108
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-9rww-66w7-7vjx.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs49th percentile — riskier than 49% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐹github.com/mattermost/mattermost-server/v6🐹github.com/mattermost/mattermost-server/v6🐹github.com/mattermost/mattermost-server/v6

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Mattermost fails to sanitize post metadata during audit logging, resulting in permalinks' contents being logged.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/mattermost/mattermost-server/v6all versions7.8.8go get github.com/mattermost/mattermost-server/v6@v7.8.8
🐹Gogithub.com/mattermost/mattermost-server/v6≥ 7.9.0&&< 7.9.67.9.6go get github.com/mattermost/mattermost-server/v6@v7.9.6
🐹Gogithub.com/mattermost/mattermost-server/v6≥ 7.10.0&&< 7.10.47.10.4go get github.com/mattermost/mattermost-server/v6@v7.10.4

Affected Products

1 product · 3 configurations
Application
mattermostmattermost
≥ 7.10.0 && < 7.10.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost-server/v6, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/mattermost/mattermost-server/v6 to 7.8.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9rww-66w7-7vjx is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Mattermost fails to sanitize post metadata during audit logging, resulting in permalinks' contents being logged.
O3 Security · Impact-Aware SCA

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Mattermost fails to sanitize post metadata (Medium 4.5)