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CVE-2026-4600

Estado: ModificadaAlta (8.1)—

Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad en librería criptográfica (jsrsasign) accesible remotamente sin autenticación que permite forjar firmas DSA y certificados X.509. CWE-347 (verificación criptográfica impropia) + AV:N/PR:N/UI:N confirman explotación remota sin privilegios. El atacante puede falsificar certificados (T15

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementVulnerability ScanningRestrict File and Directory PermissionsRestrict Registry PermissionsRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

Kjur — Jsrsasign

CWE

Referencias

JSON original (NVD)

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