GHSA-VXG2-HHGR-37FX

Vulnerability from github – Published: 2026-04-03 06:31 – Updated: 2026-04-04 06:53
VLAI?
Summary
Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
Details

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.

Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "roundcube/roundcubemail"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.7-beta"
            },
            {
              "fixed": "1.7-rc5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35540"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-669",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:53:55Z",
    "nvd_published_at": "2026-04-03T05:16:22Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.",
  "id": "GHSA-vxg2-hhgr-37fx",
  "modified": "2026-04-04T06:53:55Z",
  "published": "2026-04-03T06:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35540"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870"
    },
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/roundcube/roundcubemail"
    },
    {
      "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:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.