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CVE-2026-39924

Estado: AplazadaAlta (7.6)—

Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the access_tokens table is never cleared on password change events. The TokensClearer::clearPasswordTokens() function only removes rows from the password_tokens table while leaving all active session cookies and API bearer tokens intact, including long-lived RememberAccessToken entries, and administrator-forced password resets via the user update endpoint are equally ineffective at revoking attacker-held sessions.

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.

Acceso remoto con PR:L; atacante mantiene sesión válida tras cambio de contraseña. CWE-613 permite retención no autorizada de tokens activos.

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 ManagementMulti-factor AuthenticationDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramPassword Policies

Tecnologías afectadas (1)

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

Flarum — FlarumAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-39924",
  "cveTags": [],
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          "id": "CVE-2026-39924",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-08-05T15:48:45.636552Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
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    "cvssMetricV40": [
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        "type": "Secondary",
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        "cvssData": {
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          "valueDensity": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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      "affectedData": [
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          "repo": "https://github.com/flarum/framework",
          "vendor": "Flarum",
          "product": "Flarum Framework",
          "versions": [
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              "version": "0",
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  "published": "2026-08-05T16:16:56.137",
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      "url": "https://github.com/flarum/framework/commit/5f080293a029d0d273eb9678d597c74ea86a3bcc",
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    {
      "url": "https://github.com/flarum/framework/pull/4546",
      "source": "disclosure@vulncheck.com"
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    {
      "url": "https://github.com/flarum/framework/releases/tag/v1.8.16",
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    {
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      "lang": "en",
      "value": "Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the access_tokens table is never cleared on password change events. The TokensClearer::clearPasswordTokens() function only removes rows from the password_tokens table while leaving all active session cookies and API bearer tokens intact, including long-lived RememberAccessToken entries, and administrator-forced password resets via the user update endpoint are equally ineffective at revoking attacker-held sessions."
    }
  ],
  "lastModified": "2026-09-09T20:35:08.537",
  "sourceIdentifier": "disclosure@vulncheck.com"
}