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HIGH severity

CVE-2026-2476 — mattermost-plugin-msteams

HIGHFix: mattermost/mattermost-plugin-msteams@036c761

CVE-2026-2476 is a high-severity (CVSS 7.6) Information Exposure vulnerability in github.com/mattermost/mattermost-plugin-msteams. A fix is available for github.com/mattermost/mattermost-plugin-msteams — see the affected versions and patch details below.

MS Teams plugin sensitive config values not properly masked in support packets

Also known asGHSA-4ppj-6chv-5pgcGO-2026-4784
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 8, 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 CVE-2026-2476.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk+0.00%
Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk
0.00%0.23%0.46%0.69%0.0%0.2%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-plugin-msteams

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 Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/mattermost/mattermost-plugin-msteamsall versions1.15.1-0.20260102165339-036c761bd3cbgo get github.com/mattermost/mattermost-plugin-msteams@v1.15.1-0.20260102165339-036c761bd3cb

Affected Products

1 product · 1 configurations
Application
ms teamsmattermost
< 2.3.1
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-plugin-msteams, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/mattermost/mattermost-plugin-msteams to 1.15.1-0.20260102165339-036c761bd3cb or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-2476 is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

Mattermost Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606
O3 Security · Impact-Aware SCA

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CVE-2026-2476: mattermost-plugin — Fix Available