CVE-2026-28413 Products.isurlinportal: Possible open redirect when using more than 2 forward slashes
Attackers can redirect users to external sites after login via crafted URLs with multiple slashes, affecting Plone users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28413?
CVE-2026-28413 is a medium-severity vulnerability in plone Products.isurlinportal, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.
Weakness: CWE-601
Which versions are affected by CVE-2026-28413?
9 open source packages ship an affected version, including Products.isurlinportal and products-isurlinportal. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Products.isurlinportal PyPI | All versions | 2.1.0 |
Products.isurlinportal PyPI | From 3.0.0 | 3.1.0 |
Products.isurlinportal PyPI | From 4.0.0a1 | 4.0.0 |
products-isurlinportal PyPI | All versions | 2.1.0, 3.1.0 |
products-isurlinportal PyPI | All versions | 2.1.0 |
products-isurlinportal PyPI | All versions | 2.1.0 |
3 more packages
products-isurlinportal PyPI | From 3.0.0 | 3.1.0 |
products-isurlinportal PyPI | From 3.0.0 | 3.1.0 |
products-isurlinportal PyPI | From 4.0.0a1 | 4.0.0 |
Products include Plone Isurlinportal.
How do I fix CVE-2026-28413?
Upgrade Products.isurlinportal to a fixed version for your release line: 2.1.0, 3.1.0 or 4.0.0.
Is CVE-2026-28413 being exploited?
There is no known exploitation of CVE-2026-28413 in the wild and no public exploit code.
Other vulnerabilities in plone Products.isurlinportal
Sources
Also known as GHSA-43gx-6gv6-3jcp, PYSEC-2026-112.