CVE-2026-42421: OpenClaw before 2026.4.8 contains a session management vulnerability where existing WebSocket sessions survive

Routine

MEDIUM 5.4UPGRADE

CVE-2026-42421 is a medium-severity flaw (CVSS 5.4) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenClaw before 2026.4.8 contains a session management vulnerability where existing WebSocket sessions survive shared gateway token rotation. Attackers can maintain unauthorized access to WebSocket connections after token rotation by exploiting the failure to disconnect existing shared-token sessions.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-613
Published	2026-04-28
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

2026-04-28 19:37 UTCPublished CVE record published
2026-06-17 10:47 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.4.8

Fixed in: 2026.4.8

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.4.8

npm install openclaw@">=2026.4.8"

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-2026-42421?

openclaw: upgrade to 2026.4.8. Exact commands for each OS are on this page.

Is CVE-2026-42421 being exploited?

CVE-2026-42421 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-2026-42421 affect?

CVE-2026-42421 affects openclaw. Severity is medium (CVSS 5.4). OpenClaw before 2026.4.8 contains a session management vulnerability where existing WebSocket sessions survive shared gateway token rotation. Attackers can maintain unauthorized access to WebSocket connections after token rotation by exploi

How urgent is CVE-2026-42421?

Priority 21/100. No elevated risk signals yet.

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References

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