CVE-2026-42509: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache W

Routine

MEDIUM 6.1WATCHLISTUPGRADE

CVE-2026-42509 is a medium-severity flaw (CVSS 6.1) affecting wicket. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache Wicket. This issue affects Apache Wicket: from 8.0.0 through 8.17.0, 9.0.0, from 10.0.0 through 10.8.0. Users are recommended to upgrade to version 10.9.0, which fixes the issue.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-06
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-06 10:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

apache wicket UPGRADE

Affected: >= 8.0.0 and <= 8.17.0 · >= 9.0.0 and <= 9.22.0 · >= 10.0.0 and < 10.9.0

Fixed in: 10.9.0

Safe to downgrade to: a release before 8.0.0

1. Check installed version

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

2. UPGRADE to 10.9.0 (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 8.0.0 (Debian / Ubuntu)

apt-cache madison wicket sudo apt install wicket=<VERSION_BEFORE_8.0.0> 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_8.0.0> 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.

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-2026-42509?

wicket: upgrade to 10.9.0. Exact commands for each OS are on this page.

Is CVE-2026-42509 being exploited?

CVE-2026-42509 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-2026-42509 affect?

CVE-2026-42509 affects wicket. Severity is medium (CVSS 6.1). Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache Wicket. This issue affects Apache Wicket: from 8.0.0 through 8.17.0, 9.0.0, from 10.0.0 through 10.8.0. Users are recommended to

How urgent is CVE-2026-42509?

Priority 34/100. On your watchlist

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References

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