Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect

{
  "id": "cecca132c424e254b319860c6f0ef89ad34f9a2841670ec73cbcf6a4302e0379",
  "url": "https://osv.dev/vulnerability/CVE-2026-40080",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect",
    "summary": "Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Open Redirect through a substring check rather than a host check at str_contains($referer, CACTI_PATH_URL). When the user's login_opts == '1' (redirect to referer after login), the function used $_SERVER['HTTP_REFERER'] directly. An attacker could craft a referer such as https://evil.com/cacti/. Where CACTI_PATH_URL is /cacti/, the substring matches and the user is redirected to evil.com after login. The pre-existing validate_redirect_url() helper at lib/html_utility.php performed proper validation but was not invoked from auth_login_redirect(). This issue has been fixed in version 1.2.31.",
    "evidence": "osv:CVE-2026-40080",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-40080",
      "aliases": [
        "CVE-2026-40080",
        "GHSA-6gr7-53g8-vchq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cacti/cacti",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1e8eaca26b84b128c39ce8cc8ece42d7ff76aac1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.31"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.31"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
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            "release/1.2.29",
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            "release/1.2.19",
            "releaes/1.2.19",
            "release/1.2.18",
            "release/1.2.17",
            "rel-1.2.17",
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            "release/1.1.30",
            "release/1.1.29",
            "release/1.1.28",
            "release/1.1.27",
            "release/1.1.26",
            "release/1.1.25",
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            "release/1.1.21",
            "release/1.1.20",
            "release/1.1.19",
            "release/1.1.18",
            "release/1.1.17",
            "release/1.1.16",
            "release/1.1.15",
            "release/1.1.14",
            "release/1.1.13",
            "release/1.1.12",
            "release/1.1.11",
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            "release/1.1.3",
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            "release/1.1.1",
            "release/1.1.0",
            "release/1.0.6",
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            "release/1.0.4",
            "release/1.0.3",
            "release/1.0.2",
            "release/1.0.1",
            "release/1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40080.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.415742241Z",
      "provider": "osv",
      "references": [
        "https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40080.json",
        "https://github.com/Cacti/cacti/security/advisories/GHSA-6gr7-53g8-vchq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40080"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-601"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40080.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40080",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497149,
  "published_at": "2026-06-25T22:29:51.784+00:00"
}