{"id":"CVE-2021-21337","aliases":["GHSA-p44j-xrqg-4xrr","PYSEC-2021-45"],"url":"https://o3.security/vulnerability/CVE-2021-21337","summary":"URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService","details":"### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nOpen redirect vulnerability - a maliciously crafted link to the login form and login functionality could redirect the browser to a different website.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nThe 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\"`\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nThere is no workaround. Users are encouraged to upgrade.\n\n### References\n_Are there any links users can visit to find out more?_\n\n- [GHSA-p44j-xrqg-4xrr](https://github.com/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrr)\n- [Products.PluggableAuthService on PyPI](https://pypi.org/project/Products.PluggableAuthService/)\n- [OWASP page on open redirects](https://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in the [Products.PluggableAuthService issue tracker](https://github.com/zopefoundation/Products.PluggableAuthService/issues)\n* Email us at [security@plone.org](mailto:security@plone.org)","published":"2021-03-08T21:15:16.807Z","modified":"2026-07-09T12:20:30.672404Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"products-pluggableauthservice","fixedVersion":"2.6.1"}],"fix":{"url":"https://github.com/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfa","label":"zopefoundation/Products.PluggableAuthService@7eead06"},"references":[{"type":"ADVISORY","url":"https://github.com/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrr"},{"type":"FIX","url":"https://github.com/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfa"},{"type":"PACKAGE","url":"https://pypi.org/project/Products.PluggableAuthService/"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21337"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/products-pluggableauthservice/PYSEC-2021-45.yaml"},{"type":"PACKAGE","url":"https://github.com/zopefoundation/Products.PluggableAuthService"},{"type":"WEB","url":"https://pypi.org/project/Products.PluggableAuthService"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T12:20:30.672404Z"}}