How severe is CVE-2026-35646?

CVE-2026-35646 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-35646 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35646?

CVE-2026-35646 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35646?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35646 have an EU (EUVD) identifier?

Yes. CVE-2026-35646 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21144.

When was CVE-2026-35646 published?

CVE-2026-35646 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-35646

CVE-2026-35646 is a medium-severity vulnerability in Openclaw with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v4: 6.3
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21144
Weakness: CWE-307
Affected product: Openclaw
Published: 2026-04-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-35646?: 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.
How severe is CVE-2026-35646?: CVE-2026-35646 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-35646 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35646?: CVE-2026-35646 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35646?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35646 have an EU (EUVD) identifier?: Yes. CVE-2026-35646 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21144.
When was CVE-2026-35646 published?: CVE-2026-35646 was published on 2026-04-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*

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