CVE-2026-3691VulnerabilityPublished 30 Mar 2026

ZDI-26-229: OpenClaw Client PKCE Verifier Information Disclosure Vulnerability

Source Zero Day Initiative

Compare

Not known to be exploited.

Data as of 30 Oct 2026, 06:59 UTC

Severity

Medium

Rated Medium by Zero Day Initiative · No CVSS score from NVD or the CNA

EPSS: 0.4% chance of exploitation in 30 days – higher than 39% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

remote

What to do

AI-suggested

OpenClaw has issued an official update that corrects this vulnerability. Users and administrators should apply the update provided by OpenClaw as soon as possible to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.

Description

This vulnerability allows remote attackers to disclose stored credentials on affected installations of OpenClaw. User interaction is required to exploit this vulnerability in that the target must initiate an OAuth authorization flow. The ZDI has assigned a CVSS rating of 5.3. The following CVEs are assigned: CVE-2026-3691.

Impact

Successful exploitation can lead to disclosure of stored credentials, potentially enabling further compromise of the affected system or user accounts. The vulnerability does not affect integrity or availability but impacts confidentiality. User interaction is required, which limits the ease of exploitation.

Summary

This vulnerability in OpenClaw's OAuth authorization implementation exposes sensitive data, including stored credentials, in the authorization URL query string. Remote attackers can exploit this flaw by tricking a user into initiating an OAuth authorization flow, leading to credential disclosure. The vulnerability has a CVSS score of 5.3, indicating a moderate severity level. OpenClaw has released a security update to fix this issue, as detailed in their GitHub security advisory.

References

zerodayinitiative.com/advisories/ZDI-26-229/ (opens in a new tab)

Community reviews

Loading reviews…