{"id":"CVE-2021-21337","aliases":["EUVD-2021-0201","GHSA-p44j-xrqg-4xrr","PYSEC-2021-45"],"status":"published","title":"URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService","description":"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\u003e=2.6.1\".","severity":{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.08443,"percentile":0.95074,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-601"],"published":"2021-03-08T21:06:23Z","modified":"2026-10-20T10:54:28Z","exploits":[{"source":"exploitdb","id":"EDB-49930","title":"Products.PluggableAuthService 2.6.0 - Open Redirect","type":"webapps","platform":"python","date":"2021-06-02","url":"https://www.exploit-db.com/exploits/49930"}],"fixes":[{"ecosystem":"PyPI","package":"products-pluggableauthservice","fixed_in":["2.6.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"products-pluggableauthservice","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"products-pluggableauthservice","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.1"}]}],"versions":["1.10.0","1.11.0","1.11.1","1.11.2","1.11.3","1.5.2","1.5.2.1","1.5.3","1.5.4","1.5.5","1.6","1.6.1","1.6.2","1.6.3","1.6.4","1.6.5","1.7.0","1.7.0b1","1.7.0b2","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.7.8","1.8.0","1.9.0","2.0","2.0b1","2.0b2","2.0b3","2.0b4","2.0b5","2.0b6","2.1","2.1.1","2.2","2.2.1","2.3","2.4","2.5","2.5.1","2.6.0"]},{"source":"osv","ecosystem":"PyPI","package":"products-pluggableauthservice","ranges":[{"type":"GIT","events":[{"introduced":"0"},{"fixed":"7eead067898852ebd3e0f143bc51295928528dfa"}]},{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.1"}]}],"versions":["1.5.2","1.5.2.1","1.5.3","1.5.4","1.5.5","1.6","1.6.1","1.6.2","1.6.3","1.6.4","1.6.5","1.7.0b1","1.7.0b2","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.7.8","1.8.0","1.9.0","1.10.0","1.11.0","1.11.1","1.11.2","1.11.3","2.0b1","2.0b2","2.0b3","2.0b4","2.0b5","2.0b6","2.0","2.1","2.1.1","2.2","2.2.1","2.3","2.4","2.5","2.5.1","2.6.0"]}],"products":[{"vendor":"zope","product":"products.pluggableauthservice"},{"vendor":"zopefoundation","product":"products.pluggableauthservice"}],"references":[{"url":"https://pypi.org/project/Products.PluggableAuthService/","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory","package"]},{"url":"https://github.com/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrr","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfa","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"http://packetstormsecurity.com/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21337","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/products-pluggableauthservice/PYSEC-2021-45.yaml","tags":["web"]},{"url":"https://pypi.org/project/Products.PluggableAuthService","tags":["web"]},{"url":"https://github.com/advisories/GHSA-p44j-xrqg-4xrr"},{"url":"https://github.com/zopefoundation/Products.PluggableAuthService","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-21337","title":"URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService","description":"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\u003e=2.6.1\".","status":"published","published":"2021-03-08T21:10:20Z","modified":"2024-08-03T18:09:15.746Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-0201","description":"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\u003e=2.6.1\".","status":"published","published":"2021-03-08T21:10:20Z","modified":"2024-08-03T18:09:15Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:06.913643Z"}],"ghsa":[{"id":"GHSA-p44j-xrqg-4xrr","title":"URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService","description":"### 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\u003e=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)","status":"published","published":"2021-03-08T21:06:23Z","modified":"2024-10-21T19:59:54Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:38:12.325695Z"}],"nvd":[{"id":"CVE-2021-21337","description":"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\u003e=2.6.1\".","status":"published","published":"2021-03-08T21:15:16.807Z","modified":"2026-06-17T03:35:19.603Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:06:50.399901Z"}],"osv":[{"id":"CVE-2021-21337","description":"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\u003e=2.6.1\".","status":"published","published":"2021-03-08T21:15:16.807Z","modified":"2026-10-20T10:54:28.226847984Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"GHSA-p44j-xrqg-4xrr","title":"URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService","description":"### 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\u003e=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)","status":"published","published":"2021-03-08T21:06:23Z","modified":"2026-07-08T06:27:50.34293258Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:52.534897Z"},{"id":"PYSEC-2021-45","description":"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\u003e=2.6.1\".","status":"published","published":"2021-03-08T21:15:00Z","modified":"2023-11-08T04:04:41.823807Z","updated_at":"2026-11-02T15:52:53.119977Z"}]}}