What’s Vulnerable › Vulnerabilities
CVE-2026-24661: Unbounded Request Body Read in MS Teams Plugin {{/changes}} Webhook Endpoint
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-09 · updated 2026-06-17
- Weakness: CWE-770
Description
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
Affected products
- Mattermost App Framework: before 2.3.2.0 — fixed in 2.3.2.0
How to fix
Upgrade to a fixed version: Mattermost App Framework 2.3.2.0. Check the vendor advisory for mitigations.
References
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