CVE-2021-21337
In Products.PluggableAuthService before version 2.6.0 there is an open redirect vulnerability.
Does this matter?
A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 8.4%. Treat it as high on anything reachable from the internet.
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>=2.6.1".
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 8.44% probability · 95th percentile
- Public exploits
- 1 in Exploit-DB · first 2 June 2021
- CISA KEV
- Not listed
- Weakness
- CWE-601
- Affected
- zope/products.pluggableauthservice
- Source
- security-advisories@github.com
EPSS 8.4% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.htmlExploit, Third Party Advisory, VDB Entry
- https://github.com/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfaPatch, Third Party Advisory
- https://github.com/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrrThird Party Advisory
- https://pypi.org/project/Products.PluggableAuthService/Product, Third Party Advisory
- http://packetstormsecurity.com/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.htmlExploit, Third Party Advisory, VDB Entry
- https://github.com/zopefoundation/Products.PluggableAuthService/commit/7eead067898852ebd3e0f143bc51295928528dfaPatch, Third Party Advisory
- https://github.com/zopefoundation/Products.PluggableAuthService/security/advisories/GHSA-p44j-xrqg-4xrrThird Party Advisory
- https://pypi.org/project/Products.PluggableAuthService/Product, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.