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GHSA-5C37-5J7W-8MH8

Vulnerability from github – Published: 2026-06-09 18:31 – Updated: 2026-07-31 19:22
VLAI
Summary
LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it.
Details

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "limesurvey/limesurvey"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "7.0.0-beta1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-50635"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-640"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-31T19:22:30Z",
    "nvd_published_at": "2026-06-09T18:17:10Z",
    "severity": "HIGH"
  },
  "details": "LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target\u0027s username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host\u0027s newPassword endpoint to set a new password and take over the account.",
  "id": "GHSA-5c37-5j7w-8mh8",
  "modified": "2026-07-31T19:22:30Z",
  "published": "2026-06-09T18:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50635"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LimeSurvey/LimeSurvey/pull/5032"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LimeSurvey/LimeSurvey/commit/ac2a4f1673de7b56e7a342c338f36e8bb077d4b3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LimeSurvey/LimeSurvey/commit/b394cb64328aa6db95e3304f82c8c9e603e9ceb0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/LimeSurvey/LimeSurvey"
    },
    {
      "type": "WEB",
      "url": "https://www.limesurvey.org"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it."
}



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