CVE-2026-29934: A reflected cross-site scripting (XSS) vulnerability in the /admin/menus component of Lightcms v2.0 allows att

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-29934 is a medium-severity flaw (CVSS 6.1) affecting lightcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross-site scripting (XSS) vulnerability in the /admin/menus component of Lightcms v2.0 allows attackers to execute arbitrary Javascript in the context of the user's browser via modifying the referer value in the request header.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lightcms project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 15:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

lightcms project lightcms DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison lightcms sudo apt install lightcms=<VERSION_BEFORE_2.0> sudo apt-mark hold lightcms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lightcms sudo dnf downgrade lightcms-<VERSION_BEFORE_2.0> sudo dnf versionlock add lightcms

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-2026-29934?

lightcms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-29934 being exploited?

CVE-2026-29934 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-2026-29934 affect?

CVE-2026-29934 affects lightcms. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) vulnerability in the /admin/menus component of Lightcms v2.0 allows attackers to execute arbitrary Javascript in the context of the user's browser via modifying the referer value in the request header.

How urgent is CVE-2026-29934?

Priority 29/100. Public exploit reference

References

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