GHSA-5HF6-CRG4-FG59

Vulnerability from github – Published: 2026-04-03 06:31 – Updated: 2026-04-04 06:55
VLAI?
Summary
Roundcube: Bypass of remote image blocking via crafted BODY background attribute
Details

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via a crafted background attribute of a BODY element in an e-mail message. This may lead to information disclosure or access-control bypass.

Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "roundcube/roundcubemail"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.7-beta"
            },
            {
              "fixed": "1.7-rc5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35542"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-669"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:55:40Z",
    "nvd_published_at": "2026-04-03T05:16:22Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via a crafted background attribute of a BODY element in an e-mail message. This may lead to information disclosure or access-control bypass.",
  "id": "GHSA-5hf6-crg4-fg59",
  "modified": "2026-04-04T06:55:40Z",
  "published": "2026-04-03T06:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35542"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/e052328e3dc75f13adc2e314eaa4096ac21084ad"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/fd0e98178db5c73eaa93d005b561874923f9b0f0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/fde14d01adc9f37893cd82b635883e516ed453f8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/roundcube/roundcubemail"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.5.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"
    },
    {
      "type": "WEB",
      "url": "https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Roundcube: Bypass of remote image blocking via crafted BODY background attribute"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.