SurrealDB Race Condition Enables Session Hijacking via HTTP

SurrealDB versions before 3.1.0 contain a time-of-check/time-of-use race condition in the HTTP /rpc endpoint that allows unauthenticated requests to inherit authenticated session state. Unauthenticated attackers can send concurrent requests to the /rpc endpoint while legitimate authenticated traffic is active to execute operations with hijacked user privileges.

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched 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

SurrealDB versions prior to 3.1.0 contain a time-of-check/time-of-use (TOCTOU) race condition in the HTTP /rpc endpoint that allows unauthenticated attackers to inherit authenticated session state. By sending concurrent requests while legitimate authenticated traffic is active, attackers can execute privileged operations without valid credentials. This vulnerability affects any organization running vulnerable SurrealDB instances exposed to network access, particularly those using SurrealDB for API backends, data management, or microservices architectures. The CVSS 8.1 score reflects the high severity: attackers gain the ability to perform actions with hijacked user privileges, potentially leading to unauthorized data access, modification, or deletion depending on the victim's permission level.

Casky's 224 matching skills detect the attack patterns underlying this vulnerability by correlating indicators across MITRE ATT&CK technique TA0004 (Privilege Escalation). Claude's extended reasoning identifies the characteristic signatures of session state exploitation: detection of rapid concurrent /rpc requests from unauthenticated sources, anomalous privilege elevation in audit logs absent corresponding authentication events, and request patterns showing authenticated operations originating from previously-unauthenticated connection contexts. Practitioners using Casky would observe findings highlighting suspicious concurrent HTTP request clustering against the /rpc endpoint, privilege context mismatches in transaction logs, and behavioral anomalies indicating session state inheritance without proper authentication handshakes—all hallmarks of TOCTOU exploitation.

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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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224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-63756.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

penetration testing · medium

Run

MITRE ATT&CK Techniques

TA0004

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