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CVE-2026-89022

Estado: AplazadaCrítica (9.1)—

BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating through a different social provider sharing the same driver_id namespace. Attackers can authenticate at one enabled social provider using a user ID that matches an account linked to a different social provider, bypassing credential verification entirely because the SocialAuthService::handleLoginCallback query ignores the driver column when retrieving linked account records.

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 de autenticación en aplicación web (AV:N, PR:N, UI:N) que permite bypass de credenciales mediante manipulación de parámetros en login social, permitiendo acceso como usuario arbitrario sin verificación.

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 ManagementUser Account ManagementPassword PoliciesMulti-factor AuthenticationApplication Developer GuidanceActive Directory Configuration

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Bookstackapp — BookstackAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-89022",
  "cveTags": [],
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        "ssvcData": {
          "id": "CVE-2026-89022",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
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    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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    "cvssMetricV40": [
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          "exploitMaturity": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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      "affectedData": [
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          "repo": "https://github.com/bookstackapp/bookstack",
          "vendor": "bookstackapp",
          "product": "bookstack",
          "versions": [
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              "status": "affected",
              "version": "0",
              "lessThan": "26.05.5",
              "versionType": "custom"
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          "packageURL": "pkg:github/bookstackapp/bookstack",
          "defaultStatus": "unaffected"
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  "published": "2026-09-15T17:17:33.360",
  "references": [
    {
      "url": "https://www.bookstackapp.com/blog/bookstack-release-v26-05-5/",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://www.vulncheck.com/advisories/bookstack-authentication-bypass-via-social-login-provider-confusion",
      "source": "disclosure@vulncheck.com"
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  "vulnStatus": "Deferred",
  "weaknesses": [
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      "type": "Secondary",
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      "description": [
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          "value": "CWE-290"
        }
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  ],
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      "lang": "en",
      "value": "BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating through a different social provider sharing the same driver_id namespace. Attackers can authenticate at one enabled social provider using a user ID that matches an account linked to a different social provider, bypassing credential verification entirely because the SocialAuthService::handleLoginCallback query ignores the driver column when retrieving linked account records."
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  ],
  "lastModified": "2026-09-16T19:47:01.197",
  "sourceIdentifier": "disclosure@vulncheck.com"
}