CVE-2025-66492: Masa CMS is an open source Enterprise Content Management platform

Routine

HIGH 8.2UPGRADE

CVE-2025-66492 is a high-severity flaw (CVSS 8.2) affecting masacms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Masa CMS is an open source Enterprise Content Management platform. Versions 7.2.8 and below, 7.3.1 through 7.3.13, 7.4.0-alpha.1 through 7.4.8 and 7.5.0 through 7.5.1 are vulnerable to XSS when an unsanitized value of the ajax URL query parameter is directly included within the <head> section of the HTML page. An attacker can execute arbitrary scripts in the context of the user's session, potentially leading to Session Hijacking, Data Theft, Defa

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-12-12
Last modified	2026-10-14

Publisher (CNA): GitHub, Inc. · Vendor: masacms

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-12 05:16 UTCPublished CVE record published
2026-10-14 17:10 UTCUpdated Record last modified

masacms masacms UPGRADE

Affected: < 7.2.9 · >= 7.3.1 and < 7.3.14 · >= 7.4.0 and < 7.4.9 · >= 7.5.0 and < 7.5.2

Fixed in: 7.2.9, 7.3.14, 7.4.9, 7.5.2

Safe to downgrade to: a release before 7.3.1

1. Check installed version

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

2. UPGRADE to 7.2.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade masacms

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 7.3.1 (Debian / Ubuntu)

apt-cache madison masacms sudo apt install masacms=<VERSION_BEFORE_7.3.1> sudo apt-mark hold masacms

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

dnf --showduplicates list masacms sudo dnf downgrade masacms-<VERSION_BEFORE_7.3.1> sudo dnf versionlock add masacms

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-2025-66492?

masacms: upgrade to 7.2.9, 7.3.14, 7.4.9, 7.5.2. Exact commands for each OS are on this page.

Is CVE-2025-66492 being exploited?

CVE-2025-66492 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-2025-66492 affect?

CVE-2025-66492 affects masacms. Severity is high (CVSS 8.2). Masa CMS is an open source Enterprise Content Management platform. Versions 7.2.8 and below, 7.3.1 through 7.3.13, 7.4.0-alpha.1 through 7.4.8 and 7.5.0 through 7.5.1 are vulnerable to XSS when an unsanitized value of the ajax URL query par

How urgent is CVE-2025-66492?

Priority 33/100. High severity

Related CVEs

CVE-2024-32641 CRITICAL 9.8 UPGRADE Masa CMS is an open source Enterprise Content Management platform
CVE-2024-32643 HIGH 7.5 UPGRADE Masa CMS is an open source Enterprise Content Management platform
CVE-2024-32642 HIGH 8.8 UPGRADE Masa CMS is an open source Enterprise Content Management platform

References

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