CVE-2026-35646: OpenClaw before 2026.3.25 contains a pre-authentication rate-limit bypass vulnerability in webhook token valid

Routine

MEDIUM 4.8REMOTEUPGRADE

CVE-2026-35646 is a medium-severity flaw (CVSS 4.8) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenClaw before 2026.3.25 contains a pre-authentication rate-limit bypass vulnerability in webhook token validation that allows attackers to brute-force weak webhook secrets. The vulnerability exists because invalid webhook tokens are rejected without throttling repeated authentication attempts, enabling attackers to guess weak tokens through rapid successive requests.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-307
Published	2026-04-09
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: openclaw

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 22:16 UTCPublished CVE record published
2026-06-17 10:40 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.3.25

Fixed in: 2026.3.25

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.3.25

npm install openclaw@">=2026.3.25"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35646?

openclaw: upgrade to 2026.3.25. Exact commands for each OS are on this page.

Is CVE-2026-35646 being exploited?

CVE-2026-35646 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35646 affect?

CVE-2026-35646 affects openclaw. Severity is medium (CVSS 4.8). OpenClaw before 2026.3.25 contains a pre-authentication rate-limit bypass vulnerability in webhook token validation that allows attackers to brute-force weak webhook secrets. The vulnerability exists because invalid webhook tokens are rejec

How urgent is CVE-2026-35646?

Priority 26/100. Remotely exploitable, no login, no user action

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References

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