CVE-2026-15747

{
  "id": "CVE-2026-15747",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-07-14T18:17:12.587",
  "lastModified": "2026-10-24T21:10:00.130",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle.\n\n_csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle.\n\nAn attacker able to query it can recover the token and pass csrf_protect validation."
    },
    {
      "lang": "es",
      "value": "Las versiones de Mojolicious desde la 4.59 anteriores a la 9.48 para Perl exponen una representación estable del token CSRF de la sesión a un oráculo de compresión BREACH.\n\n_csrf_token genera y almacena en caché un token por sesión y devuelve el mismo valor en cada llamada, y _csrf_field coloca ese valor en un campo de entrada oculto ’csrf_token’. Cuando una respuesta que lleva el token también hace eco de entrada controlada por el atacante y está comprimida con gzip, los valores elegidos y las longitudes comprimidas resultantes forman un oráculo BREACH.\n\nUn atacante capaz de consultarlo puede recuperar el token y pasar la validación de csrf_protect."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "SRI",
          "product": "Mojolicious",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Mojolicious",
          "programFiles": [
            "lib/Mojolicious/Plugin/DefaultHelpers.pm",
            "lib/Mojolicious/Plugin/TagHelpers.pm",
            "lib/Mojolicious/Renderer.pm"
          ],
          "programRoutines": [
            {
              "name": "Mojolicious::Plugin::DefaultHelpers::_csrf_token"
            }
          ],
          "repo": "https://github.com/mojolicious/mojo",
          "versions": [
            {
              "version": "4.59",
              "lessThan": "9.48",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-15T16:31:33.252608Z",
          "id": "CVE-2026-15747",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-204"
        },
        {
          "lang": "en",
          "value": "CWE-352"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24e27.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/SRI/Mojolicious-9.48/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/07/14/16",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}