Security advisory

{
  "id": "32aae9b6610faf8d331972749364558448ccc8612d6865b56402c904a18c0313",
  "url": "https://osv.dev/vulnerability/CVE-2021-21337",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21337",
    "summary": "Products.PluggableAuthService is a pluggable Zope authentication and authorization framework. In Products.PluggableAuthService before version 2.6.0 there is an open redirect vulnerability. A maliciously crafted link to the login form and login functionality could redirect the browser to a different website. The problem has been fixed in version 2.6.1. Depending on how you have installed Products.PluggableAuthService, you should change the buildout version pin to `2.6.1` and re-run the buildout, or if you used `pip` simply do `pip install \"Products.PluggableAuthService>=2.6.1\".",
    "evidence": "osv:CVE-2021-21337",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-21337",
      "aliases": [
        "CVE-2021-21337",
        "GHSA-p44j-xrqg-4xrr",
        "PYSEC-2021-45"
      ],
      "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/zopefoundation/products.pluggableauthservice",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2c61f577a6486759c340643d9e2efb54abf667f9"
                },
                {
                  "fixed": "7eead067898852ebd3e0f143bc51295928528dfa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:zope:products.pluggableauthservice:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.6.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7eead067898852ebd3e0f143bc51295928528dfa"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.6.0",
            "2.5.1",
            "2.4",
            "2.3",
            "2.2.1",
            "2.2",
            "2.1.1",
            "2.1",
            "2.0",
            "2.0b6",
            "2.0b5",
            "2.0b4",
            "2.0b3",
            "1.11.0",
            "2.0b2",
            "2.0b1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21337.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:28.226847984Z",
      "provider": "osv",
      "references": [
        "https://github.com/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrr",
        "https://github.com/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfa",
        "https://pypi.org/project/Products.PluggableAuthService/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-21337",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385409,
  "published_at": "2021-03-08T21:15:16.807+00:00"
}