FalkorDB Authentication Bypass in Bolt Endpoint

An improper authentication vulnerability in the is_authenticated function (src/bolt/bolt_api.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to execute graph queries without credentials through the Bolt endpoint. The function decides whether a password is required by issuing an empty AUTH command to Redis and treats only a WRONGPASS error as meaning that a password is required; any other error, such as LOADING while a dataset is being loaded, MASTERDOWN during replication failover, or OOM under memory pressure, causes the client to be treated as authenticated. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected.

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

CVE-2026-107910 exposes a critical authentication flaw in FalkorDB's is_authenticated function that allows unauthenticated attackers to execute arbitrary graph queries against the Bolt endpoint. The vulnerability stems from flawed logic that only treats WRONGPASS errors as indicators that authentication is required; other Redis errors like LOADING or MASTERDOWN are misinterpreted as successful authentication states. This affects all versions before 4.20.0 and is particularly dangerous because graph databases often store sensitive relationship data, configuration information, and business intelligence that should be access-controlled. Organizations running FalkorDB in production environments face immediate risk of unauthorized data access, data exfiltration, and potential lateral movement if the database contains credentials or sensitive interconnected information.

Casky's 283 mapped security skills leverage Claude's extended reasoning to detect the attack patterns underlying this CVE across MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify suspicious patterns including: unauthenticated Bolt protocol connections succeeding without valid AUTH responses, graph query execution originating from untrusted network segments, and anomalous database access patterns that bypass normal credential validation workflows. The platform's skill set enables detection of reconnaissance activity probing the is_authenticated function behavior, exploitation attempts leveraging error-based authentication bypass techniques, and post-exploitation queries targeting sensitive graph structures. Security teams would see findings flagging unexpected query success without credentials, abnormal AUTH command responses, and access patterns inconsistent with legitimate application behavior—all hallmarks of this specific authentication logic flaw.

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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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-2026-107910.

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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