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LOW severity

Mattermost incorrectly issues two sessions when using desktop SSOGHSA-hm57-h27x-599c

LOWFix: mattermost/mattermost@0d6b107

GHSA-hm57-h27x-599c is a low-severity (CVSS 3.5) CWE-303 vulnerability in github.com/mattermost/mattermost/server/v8. A fix is available for github.com/mattermost/mattermost/server/v8 — see the affected versions and patch details below.

Also known asCVE-2024-10214GO-2024-3227
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 9, 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-hm57-h27x-599c.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs33th percentile — riskier than 33% of all scored CVEsHighest risk
0.00%0.29%0.59%0.88%0.4%0.4%May 26Sep 26Nov 26

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

1 pkg affected
🐹github.com/mattermost/mattermost/server/v8

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 versions 9.11.X <= 9.11.1, 9.5.x <= 9.5.9 incorrectly issues two sessions when using desktop SSO - one in the browser and one in desktop with incorrect settings.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/mattermost/mattermost/server/v8all versions8.0.0-20240821220019-0d6b1070a26fgo get github.com/mattermost/mattermost/server/v8@v8.0.0-20240821220019-0d6b1070a26f

Affected Products

1 product · 2 configurations
Application
mattermostmattermost
≥ 9.11.0 && ≤ 9.11.1
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/v8, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20240821220019-0d6b1070a26f or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hm57-h27x-599c 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 versions 9.11.X <= 9.11.1, 9.5.x <= 9.5.9 incorrectly issues two sessions when using desktop SSO - one in the browser and one in desktop with incorrect settings.
O3 Security · Impact-Aware SCA

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