CVE-2026-35628: OpenClaw before 2026.3.25 contains a missing rate limiting vulnerability in Telegram webhook authentication th

Routine

MEDIUM 4.8REMOTEUPGRADE

CVE-2026-35628 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 missing rate limiting vulnerability in Telegram webhook authentication that allows attackers to brute-force weak webhook secrets. The vulnerability enables repeated authentication guesses without throttling, permitting attackers to systematically guess webhook secrets through brute-force attacks.

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	0.3% (top 79%)
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-2026-35628?

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

Is CVE-2026-35628 being exploited?

CVE-2026-35628 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-2026-35628 affect?

CVE-2026-35628 affects openclaw. Severity is medium (CVSS 4.8). OpenClaw before 2026.3.25 contains a missing rate limiting vulnerability in Telegram webhook authentication that allows attackers to brute-force weak webhook secrets. The vulnerability enables repeated authentication guesses without throttl

How urgent is CVE-2026-35628?

Priority 27/100. Remotely exploitable, no login, no user action

Software pages

Telegram vulnerabilities

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References

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