How severe is CVE-2026-35628?

CVE-2026-35628 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-2026-35628 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35628?

CVE-2026-35628 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35628?

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

Does CVE-2026-35628 have an EU (EUVD) identifier?

Yes. CVE-2026-35628 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21114.

When was CVE-2026-35628 published?

CVE-2026-35628 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-35628

CVE-2026-35628 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% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21114
Weakness: CWE-307
Affected product: Openclaw
Published: 2026-04-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-35628?: 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.
How severe is CVE-2026-35628?: CVE-2026-35628 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-2026-35628 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35628?: CVE-2026-35628 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35628?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35628 have an EU (EUVD) identifier?: Yes. CVE-2026-35628 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21114.
When was CVE-2026-35628 published?: CVE-2026-35628 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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