Hardcoded Secret Key Enables API Authentication Bypass

openssl_encrypt versions before 1.4.0 contain a hardcoded default secret key in the standalone telemetry server configuration that is used for API key hashing. Attackers who know this default value can predict or forge API key hashes to compromise telemetry API authentication.

Casky was already ahead

This CVE exploits attack patterns that Casky's 233matched 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

openssl_encrypt versions before 1.4.0 contain a hardcoded default secret key embedded in the standalone telemetry server configuration. This key is used to hash API authentication credentials, meaning attackers who discover or reverse-engineer this default value can predict or forge valid API key hashes without legitimate credentials. This vulnerability affects organizations running vulnerable versions of openssl_encrypt that expose their telemetry API endpoints. The high CVSS score of 7.5 reflects the severity: an unauthenticated attacker can bypass API authentication entirely, gaining unauthorized access to telemetry data and potentially the systems that depend on it. Any organization using affected versions should immediately upgrade to 1.4.0 or later.

Casky's 233 matched security skills leverage Claude's extended reasoning to detect the attack patterns associated with this CWE-798 vulnerability under MITRE ATT&CK technique TA0006 (Credential Access). Practitioners using Casky would identify suspicious patterns such as: repeated API authentication attempts with systematically varying hash values, successful API calls using known default credentials, API key validation failures followed by immediate successful authentication with forged hashes, and telemetry server logs showing authentication bypasses from external IP addresses. The platform helps security teams correlate these indicators across their environment, flagging instances where attackers may be exploiting the predictable nature of hardcoded cryptographic material. This proactive detection enables defenders to spot compromise attempts before sensitive telemetry data is exfiltrated.

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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 →

233 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-74892.

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

TA0006

Investigate the attack patterns behind CVE-2026-74892

Casky has 233 skills that investigate the attack patterns behind CVE-2026-74892. Run one and get CVSS-scored findings in 3 minutes.

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