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GHSA-5rfv-h47g-xj42

Mattermost MS Teams plugin doesn't limit the request body size on the /changes webhook endpoint

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-24661

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost-plugin-msteams < 1.15.1-0.20260213190728-6fe4d295592e 1.15.1-0.20260213190728-6fe4d295592e

Details

As written in the advisory (Markdown source, shown as plain text).

Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00611.

References

External links from the advisory. They lead to third-party sites.