Vulnerability Report

CVE-2026-35656

Title: Authentication bypass via X-Forwarded-For header spoofing

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-35656.

CWE Category CWE-290

Published Date Apr 10, 2026

Modified Date Apr 13, 2026

Exploit Status Not Found

Score 6.3 CVSS v4.0

Exploit Probability (EPSS)

0.31%

Vulnerability Summary

CVE-2026-35656: OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.

Impacted Vendors

openclaw 1

Reference Links

https://github.com/openclaw/openclaw/commit/630f1479c44f78484dfa21bb407cbe6f171dac87 https://github.com/openclaw/openclaw/commit/fc2d29ea926f47c428c556e92ec981441228d2a4 https://github.com/openclaw/openclaw/security/advisories/GHSA-844j-xrrq-wgh4 https://www.vulncheck.com/advisories/openclaw-xff-loopback-spoofing-bypass-in-canvas-authentication-and-rate-limiter

CVSS v4.0

Source Entity [email protected]

Severity MEDIUM

6.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-35656 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

April 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 10, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected Stack

No specific products linked.