CVE-2026-48589: Apache Shiro’s Jakarta EE module used the HTTP Referer header in certain cases to issue redirect after a user

Routine

MEDIUM 5.4WATCHLISTUPGRADE

CVE-2026-48589 is a medium-severity flaw (CVSS 5.4) affecting shiro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache Shiro’s Jakarta EE module used the HTTP Referer header in certain cases to issue redirect after a user login. In affected versions, insufficient validation of this client-controlled value could allow an attacker to influence the redirect target in applications using the Jakarta EE module. This issue affects Apache Shiro from 2.0-alpha to 2.2.0, and 3.0.0-alpha-1, only when using shiro-jakarta-ee integration module.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-05-25
Last modified	2026-07-24

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-25 21:16 UTCPublished CVE record published
2026-07-24 10:10 UTCUpdated Record last modified

apache shiro UPGRADE

Affected: >= 2.0.0 and < 2.2.1 · 3.0.0 alpha1

Fixed in: 2.2.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy shiro || rpm -q shiro || shiro --version

2. UPGRADE to 2.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade shiro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade shiro

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison shiro sudo apt install shiro=<VERSION_BEFORE_2.0.0> sudo apt-mark hold shiro

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list shiro sudo dnf downgrade shiro-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add shiro

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48589?

shiro: upgrade to 2.2.1. Exact commands for each OS are on this page.

Is CVE-2026-48589 being exploited?

CVE-2026-48589 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48589 affect?

CVE-2026-48589 affects shiro. Severity is medium (CVSS 5.4). Apache Shiro’s Jakarta EE module used the HTTP Referer header in certain cases to issue redirect after a user login. In affected versions, insufficient validation of this client-controlled value could allow an attacker to influence the redi

How urgent is CVE-2026-48589?

Priority 31/100. On your watchlist

Related CVEs

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References

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