CVE-2026-42887

{
  "id": "CVE-2026-42887",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-11T20:25:45.713",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.33.0, a stored cross-site scripting (XSS) vulnerability exists in the Login Page due to improper sanitization of the authLoginCustomMessage field of the /api/auth-settings endpoint. An attacker with administrative privileges can inject arbitrary HTML/JavaScript that will be rendered on the login page for all users. This vulnerability is fixed in 2.33.0."
    },
    {
      "lang": "es",
      "value": "Audiobookshelf es un servidor de audiolibros y podcasts autoalojado. Antes de la versión 2.33.0, existía una vulnerabilidad de cross-site scripting (XSS) almacenado en la página de inicio de sesión debido a una sanitización inadecuada del campo authLoginCustomMessage del endpoint /api/auth-settings. Un atacante con privilegios administrativos puede inyectar HTML/JavaScript arbitrario que se renderizará en la página de inicio de sesión para todos los usuarios. Esta vulnerabilidad se corrigió en la versión 2.33.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "advplyr",
          "product": "audiobookshelf",
          "versions": [
            {
              "version": "< 2.33.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N",
          "baseScore": 4.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 0.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-12T13:29:23.417280Z",
          "id": "CVE-2026-42887",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-cx29-ghq2-9cm4",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-cx29-ghq2-9cm4",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}