OpenClaw up to 2026.2.24 Inbound Message authentication replay

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenClaw up to 2026.2.24. It has been classified as critical. This impacts an unknown function of the component Inbound Message Handler. Performing a manipulation results in authentication replay. This vulnerability is reported as CVE-2026-28449. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in OpenClaw up to 2026.2.24. This affects an unknown code block of the component Inbound Message Handler. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on integrity, and availability. The summary by CVE is:

OpenClaw versions prior to 2026.2.25 lack durable replay state for Nextcloud Talk webhook events, allowing valid signed webhook requests to be replayed without suppression. Attackers can capture and replay previously valid signed webhook requests to trigger duplicate inbound message processing and cause integrity or availability issues.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-28449 since 02/27/2026. 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 T1040 for this issue.

Upgrading to version 2026.2.25 eliminates this vulnerability. Applying the patch d512163d686ad6741783e7119ddb3437f493dbbc 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.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0542). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source OpenClaw

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: 5.9
VulDB Meta Temp Score: 5.9

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Authentication replay
CWE: CWE-294 / CWE-287
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 2026.2.25
Patch: d512163d686ad6741783e7119ddb3437f493dbbc

Timelineinfo

02/27/2026 CVE reserved
03/19/2026 +20 days Advisory disclosed
03/19/2026 +0 days VulDB entry created
03/26/2026 +7 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-r9q5-c7qc-p26w
Status: Confirmed

CVE: CVE-2026-28449 (🔒)
GCVE (CVE): GCVE-0-2026-28449
GCVE (VulDB): GCVE-100-351657
CERT Bund: WID-SEC-2026-0542 - OpenClaw: Mehrere Schwachstellen

Entryinfo

Created: 03/19/2026 07:37
Updated: 03/26/2026 06:11
Changes: 03/19/2026 07:37 (79), 03/22/2026 14:34 (11), 03/23/2026 13:16 (7), 03/23/2026 22:36 (1), 03/26/2026 06:11 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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