CVE-2021-21337 json
URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService
published 2021-03-08 5 y ago modified 2026-07-08 4 mo ago also GHSA-p44j-xrqg-4xrr , PYSEC-2021-45 , EUVD-2021-0201
- cvss
- 5.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 8.4%
- EPSS 8.4% chance of exploitation in 30 days, percentile 95%
- public exploits
- 1
- Exploit-DB
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".
Patch / fix
- pypi products-pluggableauthservice 2.6.1
- zope products.pluggableauthservice 2.6.1
Timeline
- Published
- First public exploit (EDB-49930)
Exploit prediction
8.44% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-49930 Products.PluggableAuthService 2.6.0 - Open Redirect webapps, 2021-06-02
- packetstormsecurity.com http://packetstormsecurity.com/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| GitHub | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | products-pluggableauthservice | <2.6.1 |
2.6.1 |
Affected products
- zopefoundation Products.PluggableAuthService
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfa
web, patch, third-party-advisory
-
packetstormsecurity.com
/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.html
web, exploit, third-party-advisory, vdb-entry
-
pypi.org
/project/Products.PluggableAuthService/
product, third-party-advisory, package
-
github.com
/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrr
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-21337
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/products-pluggableauthservice/PYSEC-2021-45.yaml
web
-
github.com
/zopefoundation/Products.PluggableAuthService
package
-
pypi.org
/project/Products.PluggableAuthService
web
Sources
- CVE List CVE-2021-21337
- GitHub Advisory GHSA-p44j-xrqg-4xrr
- NVD CVE-2021-21337
- OSV PYSEC-2021-45
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