CVE-2026-24906: October is a Content Management System (CMS) and web platform

Routine

MEDIUM 5.4UPGRADE

CVE-2026-24906 is a medium-severity flaw (CVSS 5.4) affecting october. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a Stored Cross-Site Scripting (XSS) vulnerability in the Backend Editor Settings. The Markup Classes fields (used for paragraph styles, inline styles, table styles, etc.) did not sanitize input to valid CSS class name characters. Malicious values were rendered unsanitized in Froala editor dropdown menus, allowing JavaScript execution when an

Why this priority

No elevated risk signals yet

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	0.3% (top 84%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-14
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-04-14 18:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

octobercms october UPGRADE

Affected: <= 3.7.13 · >= 4.0.0 and <= 4.1.9

Fixed in: newer than 4.1.9

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to newer than 4.1.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade october

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 4.0.0 (Debian / Ubuntu)

apt-cache madison october sudo apt install october=<VERSION_BEFORE_4.0.0> sudo apt-mark hold october

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

dnf --showduplicates list october sudo dnf downgrade october-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add october

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-2026-24906?

october: upgrade to newer than 4.1.9. Exact commands for each OS are on this page.

Is CVE-2026-24906 being exploited?

CVE-2026-24906 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-2026-24906 affect?

CVE-2026-24906 affects october. Severity is medium (CVSS 5.4). October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a Stored Cross-Site Scripting (XSS) vulnerability in the Backend Editor Settings. The Markup Classes fields (used for paragraph style

How urgent is CVE-2026-24906?

Priority 23/100. No elevated risk signals yet.

Related CVEs

CVE-2026-22692 MEDIUM 4.9 UPGRADE October is a Content Management System (CMS) and web platform
CVE-2026-24907 MEDIUM 5.4 UPGRADE October is a Content Management System (CMS) and web platform

References

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