How severe is CVE-2026-35656?

CVE-2026-35656 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-35656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35656?

CVE-2026-35656 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35656?

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

Does CVE-2026-35656 have an EU (EUVD) identifier?

Yes. CVE-2026-35656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21458.

When was CVE-2026-35656 published?

CVE-2026-35656 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-35656

CVE-2026-35656 is a medium-severity vulnerability in Openclaw with a CVSS 3.x base score of 6.5. 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-290.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21458
Weakness: CWE-290
Affected product: Openclaw
Published: 2026-04-10
Last modified: 2026-06-17

Description

OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.

Frequently asked questions

What is CVE-2026-35656?: OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.
How severe is CVE-2026-35656?: CVE-2026-35656 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-35656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35656?: CVE-2026-35656 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35656 have an EU (EUVD) identifier?: Yes. CVE-2026-35656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21458.
When was CVE-2026-35656 published?: CVE-2026-35656 was published on 2026-04-10 and last updated on 2026-06-17.

References

Affected products (1)

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

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