CVE-2026-66391: Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wicket. This issue

This month

MEDIUM 6.5REMOTEWATCHLISTUPGRADE

CVE-2026-66391 is a medium-severity flaw (CVSS 6.5) affecting wicket. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wicket. This issue affects Apache Wicket: from 9.0.0 through 9.23.0, from 10.0.0 through 10.9.0. Users are recommended to upgrade to version 10.10.0, which fixes the issue.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-330, CWE-693
Published	2026-07-27
Last modified	2026-10-24

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

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-27 17:16 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

apache wicket UPGRADE

Affected: >= 9.0.0 and <= 9.23.0 · >= 10.0.0 and < 10.10.0

Fixed in: 10.10.0

Safe to downgrade to: a release before 9.0.0

1. Check installed version

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

2. UPGRADE to 10.10.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wicket

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 9.0.0 (Debian / Ubuntu)

apt-cache madison wicket sudo apt install wicket=<VERSION_BEFORE_9.0.0> sudo apt-mark hold wicket

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

dnf --showduplicates list wicket sudo dnf downgrade wicket-<VERSION_BEFORE_9.0.0> sudo dnf versionlock add wicket

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.

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

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-2026-66391?

wicket: upgrade to 10.10.0. Exact commands for each OS are on this page.

Is CVE-2026-66391 being exploited?

CVE-2026-66391 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-2026-66391 affect?

CVE-2026-66391 affects wicket. Severity is medium (CVSS 6.5). Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wicket. This issue affects Apache Wicket: from 9.0.0 through 9.23.0, from 10.0.0 through 10.9.0. Users are recommended to upgrade to version 10.10.0

How urgent is CVE-2026-66391?

Priority 45/100. Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-66390 MEDIUM 6.1 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache W

References

← Back to latest CVEs