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CVE-2026-27860

Estado: AnalizadaMedia (5.3)—

If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.

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 (2)

Dovecot — DovecotOpen-xchange — Dovecot

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-27860",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27860",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-27T12:33:33.962683Z"
        }
      }
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    "cvssMetricV31": [
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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          "confidentialityImpact": "LOW"
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        "impactScore": 1.4,
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  },
  "affected": [
    {
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        {
          "vendor": "Open-Xchange GmbH",
          "modules": [
            "core"
          ],
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          "versions": [
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              "version": "0",
              "versionType": "semver",
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  "published": "2026-03-27T09:16:20.383",
  "references": [
    {
      "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@open-xchange.com"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@open-xchange.com",
      "description": [
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          "lang": "en",
          "value": "CWE-90"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known."
    }
  ],
  "lastModified": "2026-06-17T10:27:48.540",
  "configurations": [
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          "negate": false,
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