Vulnerability · Published Apr 28, 2026 · Assigned by VulnCheck
CVE-2026-41405OpenClaw < 2026.3.31 - Resource Exhaustion via Unauthenticated MS Teams Webhook Body Parsing
High 7.5
In plain English
A high-severity security flaw in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 58.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
OpenClaw before 2026.3.31 parses MS Teams webhook request bodies before performing JWT validation, allowing unauthenticated attackers to trigger resource exhaustion. Remote attackers can send malicious Teams webhook payloads to exhaust server resources by bypassing authentication checks.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | openclaw | 2026.3.31 | GHSA-p464-m8x6-vhv8 |
Affected products (as reported)
Weakness: CWE-408 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-p464-m8x6-vhv8) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: OpenClaw < 2026.3.31 - Resource Exhaustion via Unauthenticated MS Teams Webhook Body Parsing third-party-advisory