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CVE-2026-23901

Estado: AnalizadaBaja (1)—

Observable Timing Discrepancy vulnerability in Apache Shiro.

This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.

Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue.

Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force attack may be able to tell, by timing the requests only, determine if the request failed because of a non-existent user vs. wrong password.

The most likely attack vector is a local attack only. Shiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well.

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Typically, brute force attack can be mitigated at the infrastructure level.

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).

Tecnologías afectadas (1)

Apache — Shiro

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-23901",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-23901",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-02-10T15:31:09.515973Z"
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          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 1
      }
    ],
    "cvssMetricV40": [
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        "type": "Secondary",
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          "version": "4.0",
          "Recovery": "AUTOMATIC",
          "baseScore": 1,
          "Automatable": "YES",
          "attackVector": "LOCAL",
          "baseSeverity": "LOW",
          "valueDensity": "CONCENTRATED",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:A/V:C/RE:L/U:Green",
          "exploitMaturity": "NOT_DEFINED",
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          "attackRequirements": "PRESENT",
          "privilegesRequired": "LOW",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "LOW",
          "vulnConfidentialityImpact": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "LOW",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "published": "2026-02-10T10:15:59.240",
  "references": [
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        "Third Party Advisory"
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      "tags": [
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
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          "value": "CWE-208"
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  "descriptions": [
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      "lang": "en",
      "value": "Observable Timing Discrepancy vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7 or later, which fixes the issue.\n\nPrior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,\nthat a brute-force attack may be able to tell, by timing the requests only, determine if\nthe request failed because of a non-existent user vs. wrong password.\n\nThe most likely attack vector is a local attack only.\nShiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well.\n\nTypically, brute force attack can be mitigated at the infrastructure level."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de discrepancia de tiempo observable en Apache Shiro.\n\nEste problema afecta a Apache Shiro: desde 1.*, 2.* antes de 2.0.7.\n\nSe recomienda a los usuarios actualizar a la versión 2.0.7 o posterior, que soluciona el problema.\n\nAntes de Shiro 2.0.7, las rutas de código para usuarios inexistentes frente a usuarios existentes son lo suficientemente diferentes como para que un ataque de fuerza bruta pueda discernir, solo cronometrando las solicitudes, si la solicitud falló debido a un usuario inexistente frente a una contraseña incorrecta.\n\nEl vector de ataque más probable es solo un ataque local.\nEl modelo de seguridad de Shiro https://shiro.apache.org/security-model.html#username_enumeration también aborda esto.\n\nTípicamente, el ataque de fuerza bruta puede mitigarse a nivel de infraestructura."
    }
  ],
  "lastModified": "2026-06-17T10:22:16.960",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "2.0.7"
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  "sourceIdentifier": "security@apache.org"
}