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CVE-2026-5081

Estado: ModificadaCrítica (9.1)—

Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure.

Apache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a thread index, with no obfuscation.

The server IP is often available to the public, and if not available, can be guessed from previous session ids being issued. The process ids may also be guessed from previous session ids. The timestamp is easily guessed (and leaked in the HTTP Date response header).

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The purpose of mod_unique_id is to assign a unique id to requests so that events can be correlated in different logs. The id is not designed, nor is it suitable for security purposes.

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.

AV:N/PR:N/UI:N permite explotación remota sin privilegios (T1190). UNIQUE_ID es predecible (IP pública, PID y timestamp adivinables), permitiendo forjar IDs de sesión y secuestrar sesiones de usuario.

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 ManagementApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account Management

Tecnologías afectadas (1)

Chorny — Apache\

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-5081",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5081",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-06T14:07:35.398679Z"
        }
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "vendor": "CHORNY",
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      "affectedData": [
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          "vendor": "Red Hat",
          "product": "Red Hat Hardened Images",
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
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  "published": "2026-05-06T13:16:09.833",
  "references": [
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      "tags": [
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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  "vulnStatus": "Modified",
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      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "description": [
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          "lang": "en",
          "value": "CWE-340"
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    {
      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
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          "lang": "en",
          "value": "CWE-341"
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      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache::Session::Generate::ModUniqueId versions from 1.54 through 1.94 for Perl session ids are insecure.\n\nApache::Session::Generate::ModUniqueId (added in version 1.54) uses the value of the UNIQUE_ID environment variable for the session id. The UNIQUE_ID variable is set by the Apache mod_unique_id plugin, which generates unique ids for the request. The id is based on the IPv4 address, the process id, the epoch time, a 16-bit counter and a thread index, with no obfuscation.\n\nThe server IP is often available to the public, and if not available, can be guessed from previous session ids being issued. The process ids may also be guessed from previous session ids. The timestamp is easily guessed (and leaked in the HTTP Date response header).\n\nThe purpose of mod_unique_id is to assign a unique id to requests so that events can be correlated in different logs. The id is not designed, nor is it suitable for security purposes."
    }
  ],
  "lastModified": "2026-07-15T01:16:39.600",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:chorny:apache\\:\\:session\\:\\:generate\\:\\:moduniqueid:*:*:*:*:*:perl:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C68EDD5C-5BA4-409E-8629-EB41AA18904F",
              "versionEndIncluding": "1.94",
              "versionStartIncluding": "1.54"
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          "operator": "OR"
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  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}