Authentication Bypass in API Token Validation

openssl_encrypt before 1.4.0 contains an authentication bypass vulnerability in the verify_api_token function that accepts any non-empty Bearer token string without validation. Attackers can upload arbitrary public keys, enumerate all keys, and revoke keys belonging to any user by providing any Bearer token in the Authorization header.

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-2026-74894 represents a critical authentication bypass vulnerability in openssl_encrypt versions before 1.4.0, where the verify_api_token function fails to properly validate Bearer tokens. The vulnerability accepts any non-empty string as a valid token, completely circumventing authentication controls. This affects any organization using vulnerable versions of openssl_encrypt for API authentication, enabling attackers to perform unauthorized key management operations including uploading arbitrary public keys, enumerating all stored keys, and revoking legitimate user credentials. With a CVSS score of 9.8, this vulnerability provides near-complete system compromise with minimal attacker effort.

Casky's 283 matching skills leverage Claude AI's extended reasoning to detect attack patterns across MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify this vulnerability through detection of improper input validation (CWE-287) patterns and observe indicators including: anomalous Bearer token usage with non-standard or repetitive values, unexpected public key uploads from unfamiliar sources, bulk key enumeration requests without proper authentication context, and unauthorized key revocation activities. The platform would correlate these attack behaviors with known privilege escalation and credential access techniques, flagging the verify_api_token function's insufficient validation logic and recommending immediate token validation implementation with cryptographic verification, rate limiting, and comprehensive audit logging of all key management operations.

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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-2026-74894.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-74894

Casky has 283 skills that investigate the attack patterns behind CVE-2026-74894. Run one and get CVSS-scored findings in 3 minutes.

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