CVE-2026-58301 Apache Shiro: Server-side POST request may be steered to an alternate host

Medium 5.9 Published 31 Aug 2026 Updated 31 Aug 2026

A low-privileged user can force the server to connect to an attacker-controlled URL via the Jakarta EE integration module, enabling data exfiltration or modification.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-58301?

CVE-2026-58301 is a medium-severity server-side request forgery vulnerability in Apache Shiro, published on 31 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

When Apache Shiro is used with the Jakarta EE integration module, a low-privileged user can craft an HTTP request that causes the server to initiate a connection to an attacker-controlled URL and transmit attacker-controlled data. This vulnerability affects Apache Shiro versions 2.x through 3.0.0 only in deployments that use the Jakarta EE integration module.

Mitigation: Upgrade to version 3.0.1 or later, which fixes the issue. + Alternatively, you can set the `org.apache.shiro.form-resubmit-host` (String) and `org.apache.shiro.form-resubmit-port` (Integer) system properties to restrict the host and port that Shiro will connect to when resubmitting a form.

Weakness: CWE-918

Which versions are affected by CVE-2026-58301?

It affects 1 product.

Products include Apache Shiro.

How do I fix CVE-2026-58301?

Upgrade to a fixed version.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-58301 being exploited?

There is no known exploitation of CVE-2026-58301 in the wild and no public exploit code.

Sources

Also known as CLEANSTART-2026-SB52604, DEBIAN-CVE-2026-58301, GHSA-r2fv-9rvj-c54c, UBUNTU-CVE-2026-58301.