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CVE-2026-27099

Estado: AnalizadaAlta (8)—

Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.

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.

CWE-79 (XSS almacenado) en descripción de Jenkins sin escapar; T1189 por XSS. Impacto: JavaScript ejecutado en navegador (T1059.007); potencial acceso a sesiones autenticadas (T1078) si el atacante roba tokens.

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

User TrainingRestrict Web-Based ContentApplication Developer GuidanceActive Directory ConfigurationUser Account ManagementPrivileged Account Management

Tecnologías afectadas (1)

Jenkins — Jenkins

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-27099",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2026-27099",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
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            },
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              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-02-18T14:55:42.504808Z"
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      "tags": [
        "Vendor Advisory"
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      "source": "jenkinsci-cert@googlegroups.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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    },
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    }
  ],
  "lastModified": "2026-06-17T10:26:40.490",
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          "operator": "OR"
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  "sourceIdentifier": "jenkinsci-cert@googlegroups.com"
}