Logseq Local HTTP API Missing Authentication Bypass

A vulnerability was found in logseq 2.0.1/2.0.2. This affects the function validate-auth-token of the file src/electron/electron/server.cljs of the component Local HTTP API. The manipulation results in missing authentication. The attack may be performed from remote. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Logseq versions 2.0.1 and 2.0.2 contain a critical authentication bypass in the Local HTTP API component. The vulnerability exists in the validate-auth-token function within src/electron/electron/server.cljs, where improper authentication validation allows attackers to interact with the API without valid credentials. This flaw affects anyone running vulnerable Logseq instances, particularly users who expose the local HTTP API to network access or those in multi-user environments. With a CVSS score of 7.3 and public exploit availability, this represents an immediate risk for unauthorized access to sensitive note data, system information, and potential lateral movement within affected networks.

Casky's 283 mapped security skills leverage Claude AI's extended reasoning to detect attack patterns associated with TA0004 (Privilege Escalation) and TA0006 (Credential Access) techniques. Practitioners using the platform would identify suspicious activity patterns including: unauthenticated API requests to Logseq endpoints, token validation failures that succeed without proper credentials, and anomalous access to protected resources from unexpected network sources. The skills correlate CWE-287 (Improper Authentication) and CWE-306 (Missing Authentication for Critical Function) indicators with behavioral telemetry, surfacing reconnaissance attempts against the HTTP API, unauthorized data exfiltration, and privilege escalation attempts that exploit the missing validation logic. This multi-layered detection approach helps security teams pinpoint exploitation before attackers establish persistent access.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-124573.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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