OpenClaw up to 2026.3.24 excessive authentication

Summaryinfo

A vulnerability was found in OpenClaw up to 2026.3.24. It has been rated as problematic. This vulnerability affects unknown code. This manipulation causes excessive authentication. This vulnerability is registered as CVE-2026-35646. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in OpenClaw up to 2026.3.24 and classified as problematic. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a excessive authentication vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

OpenClaw before 2026.3.25 contains a pre-authentication rate-limit bypass vulnerability in webhook token validation that allows attackers to brute-force weak webhook secrets. The vulnerability exists because invalid webhook tokens are rejected without throttling repeated authentication attempts, enabling attackers to guess weak tokens through rapid successive requests.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-35646 since 04/04/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1110.001 according to MITRE ATT&CK.

Upgrading to version 2026.3.25 eliminates this vulnerability. Applying the patch 0b4d07337467f4d40a0cc1ced83d45ceaec0863c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Artificial Intelligence Software

Name

• OpenClaw

Version

• 2026.3.0
• 2026.3.1
• 2026.3.2
• 2026.3.3
• 2026.3.4
• 2026.3.5
• 2026.3.6
• 2026.3.7
• 2026.3.8
• 2026.3.9
• 2026.3.10
• 2026.3.11
• 2026.3.12
• 2026.3.13
• 2026.3.14
• 2026.3.15
• 2026.3.16
• 2026.3.17
• 2026.3.18
• 2026.3.19
• 2026.3.20
• 2026.3.21
• 2026.3.22
• 2026.3.23
• 2026.3.24

License

• open-source

Website

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

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion