OpenClaw up to 2026.3.30 Webhook Request amplification

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenClaw up to 2026.3.30. It has been declared as problematic. This affects an unknown function of the component Webhook Request Handler. Executing a manipulation can lead to amplification. This vulnerability is handled as CVE-2026-41405. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenClaw up to 2026.3.30. It has been declared as problematic. This vulnerability affects some unknown processing of the component Webhook Request Handler. The manipulation with an unknown input leads to a amplification vulnerability. The CWE definition for the vulnerability is CWE-408. The product allows an entity to perform a legitimate but expensive operation before authentication or authorization has taken place. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-41405 since 04/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.002.

Upgrading to version 2026.3.31 eliminates this vulnerability. Applying the patch 3834d47099dd13c8244ed6de8b9ea9855c553623 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.

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Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Amplification
CWE: CWE-408 / CWE-405 / CWE-400
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenClaw 2026.3.31
Patch: 3834d47099dd13c8244ed6de8b9ea9855c553623

Timelineinfo

04/20/2026 CVE reserved
04/28/2026 +8 days Advisory disclosed
04/28/2026 +0 days VulDB entry created
04/28/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-p464-m8x6-vhv8
Status: Confirmed

CVE: CVE-2026-41405 (🔒)
GCVE (CVE): GCVE-0-2026-41405
GCVE (VulDB): GCVE-100-360016

Entryinfo

Created: 04/28/2026 21:54
Changes: 04/28/2026 21:54 (78)
Complete: 🔍
Cache ID: 216::103

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