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Openclaw CVE-2026-35654

| EUVDEUVD-2026-21454 MEDIUM
Authentication Bypass Using an Alternate Path or Channel (CWE-288)
2026-04-10 VulnCheck
6.9
CVSS 4.0 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Alternate path authentication
Impact

The CVSS v3.1 score of 5.3 reflects a medium-severity vulnerability with network attack vector (AV:N), low complexity (AC:L), and no privilege requirements (PR:N), indicating that any unauthenticated remote attacker can exploit this without special conditions. The impact is integrity-focused (I:L) with no confidentiality or availability loss, meaning attackers can modify or inject unauthorized feedback data rather than access or disrupt systems. While the CVSS score is moderate, the practical risk depends on the sensitivity of feedback data within organizational Teams deployments and the value of maintaining audit integrity for session feedback. The authentication bypass nature (CWE-288) elevates concern beyond a simple validation flaw, as it directly undermines trust in the feedback mechanism. The fact that a vendor patch is available and this was disclosed responsibly (GitHub security advisory) suggests coordinated disclosure rather than widespread active exploitation. In SSVC terms, this is exploitable with network access and low complexity, but the integrity-only impact and lack of evidence of widespread abuse suggest this is a medium priority requiring timely patching but not an immediate critical emergency.

Exploit ScenarioDerived

An attacker can craft a network request to the OpenClaw feedback invoke endpoint without providing valid sender credentials, bypassing the allowlist check that should restrict feedback operations to authorized senders. The attacker then triggers unauthorized session feedback recording or reflection, potentially capturing or modifying feedback data intended for restricted participants. This could be chained with social engineering or internal reconnaissance to target specific Teams channels or sessions within an organization.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 10, 2026

OpenClaw before version 2026.3.25 allows unauthenticated remote attackers to bypass sender allowlist checks in Microsoft Teams feedback invoke endpoints, enabling unauthorized recording of session feedback. The vulnerability exploits improper authorization logic in feedback processing, granting attackers the ability to trigger feedback recording or reflection operations that should be restricted to authorized senders. No public exploit code has been identified at the time of analysis.

RemediationAI

Vendors should upgrade OpenClaw to version 2026.3.25 or later, which includes fixes to the feedback invoke endpoint authorization logic. The upstream fix is documented in commit c5415a474bb085404c20f8b312e436997977b1ea on the OpenClaw GitHub repository. Organizations should apply this patch immediately to prevent unauthorized feedback recording in their Teams integrations. For detailed guidance, refer to the official GitHub security advisory at https://github.com/openclaw/openclaw/security/advisories/GHSA-rf6h-5gpw-qrgq and the vendor's advisory at https://www.vulncheck.com/advisories/openclaw-authorization-bypass-in-microsoft-teams-feedback-invoke. If immediate patching is not possible, review feedback invoke endpoint access logs for suspicious patterns and consider temporarily disabling Teams feedback functionality until the patch is deployed.

Affected VersionsENISA

OpenClaw 0 <2026.3.25

Affected Packages

npm openclaw fix: 2026.3.25, 2026.3.28

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability exists in OpenClaw's Microsoft Teams integration, specifically in the feedback invoke endpoint handlers that process feedback-related operations. The root cause is classified as CWE-288 (Authentication Using a Broken or Risky Cryptographic Algorithm), indicating that the allowlist mechanism protecting sender authorization fails to properly validate request origins or credentials. The feedback invoke endpoints are network-accessible components within the OpenClaw application that interact with Microsoft Teams, and attackers can craft requests that circumvent the intended sender validation logic, allowing arbitrary parties to trigger sensitive feedback operations that should only be available to whitelisted participants. The vulnerability affects the OpenClaw application across versions prior to 2026.3.25, as indicated by the CPE string cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:*:*:*.

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Severity by source

NVD PRIMARY 6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
Low
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
Patch released
Apr 10, 2026 - 16:30 nvd
Patch available
CVE Published
Apr 10, 2026 - 16:03 nvd
MEDIUM 6.9

DescriptionCVE.org

OpenClaw before 2026.3.25 contains an authorization bypass vulnerability in Microsoft Teams feedback invokes that allows unauthorized senders to record session feedback. Attackers can bypass sender allowlist checks via feedback invoke endpoints to trigger unauthorized feedback recording or reflection.

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 3 npm packages depend on openclaw (3 direct, 0 indirect)

Ecosystem-wide dependent count for version 2026.3.28.

Threat Intelligence Overview

EPSS Score
0.0%
Top 93% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment CIRCL GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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