Vulnerability Report

CVE-2026-28475

Title: Timing Attack for Hook Token Recovery

Input Validation Error

Proof Of Concept

No public PoC currently indexed for CVE-2026-28475.

CWE Category CWE-208

Published Date Mar 05, 2026

Modified Date Mar 11, 2026

Exploit Status Not Found

Score 6.3 CVSS v4.0

Exploit Probability (EPSS)

0.28%

Vulnerability Summary

CVE-2026-28475: OpenClaw versions prior to 2026.2.13 use non-constant-time string comparison for hook token validation, allowing attackers to infer tokens through timing measurements. Remote attackers with network access to the hooks endpoint can exploit timing side-channels across multiple requests to gradually recover the authentication token.

Impacted Vendors

openclaw 1

Reference Links

https://github.com/openclaw/openclaw/commit/113ebfd6a23c4beb8a575d48f7482593254506ec https://github.com/openclaw/openclaw/security/advisories/GHSA-47q7-97xp-m272 https://www.vulncheck.com/advisories/openclaw-timing-attack-via-hook-token-comparison

CVSS v4.0

Source Entity [email protected]

Severity MEDIUM

6.3

Attack Vector

NETWORK

Complexity

HIGH

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:H/AT:N/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 LOW

3.7

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

4.8

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns