OpenClaw up to 2026.8.0 SMS Webhook Rate Limit excessive authentication

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenClaw up to 2026.8.0. Affected by this issue is some unknown functionality of the component SMS Webhook Rate Limit. Performing a manipulation results in excessive authentication. This vulnerability is known as CVE-2026-100571. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in OpenClaw up to 2026.8.0. This affects an unknown functionality of the component SMS Webhook Rate Limit. The manipulation with an unknown input leads to a excessive authentication vulnerability. CWE is classifying the issue as CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. This is going to have an impact on confidentiality. The summary by CVE is:

OpenClaw (npm package 'openclaw') versions >= 2026.6.6 and < 2026.8.1 apply the SMS webhook invalid-request rate limit before Twilio signature verification and identify clients only by the raw proxy socket address. In deployments where the SMS/Twilio webhook sits behind a trusted reverse proxy or tunnel so that multiple external clients share one socket address, an unauthenticated remote sender can exhaust the shared pre-authentication rate-limit budget with invalid requests, causing subsequent correctly signed Twilio callbacks to receive HTTP 429 responses. The result is temporary inbound SMS loss while the shared window remains exhausted; the attacker cannot forge a callback or access message data. Fixed in 2026.8.1.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-100571 since 09/26/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1110.001 for this issue.

Upgrading to version 2026.8.1 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Artificial Intelligence Software

Name

• OpenClaw

Version

• 2026.0
• 2026.1
• 2026.2
• 2026.3
• 2026.4
• 2026.5
• 2026.6
• 2026.7
• 2026.8.0

Website

• Product: https://github.com/openclaw/openclaw/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion