CVE-2025-25062: An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3

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MEDIUM 4.4UPGRADE

CVE-2025-25062 is a medium-severity flaw (CVSS 4.4) affecting backdrop cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3. It doesn't sufficiently isolate long text content when the CKEditor 5 rich text editor is used. This allows a potential attacker to craft specialized HTML and JavaScript that may be executed when an administrator attempts to edit a piece of content. This vulnerability is mitigated by the fact that an attacker must have the ability to create long text conten

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: backdropcms

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

Am I affected?

Timeline

2025-02-03 04:15 UTCPublished CVE record published
2026-06-17 09:00 UTCUpdated Record last modified

backdropcms backdrop cms UPGRADE

Affected: >= 1.28.0 and < 1.28.5 · >= 1.29.0 and < 1.29.3

Fixed in: 1.28.5, 1.29.3

Safe to downgrade to: a release before 1.28.0

1. Check installed version

apt-cache policy backdrop-cms || rpm -q backdrop-cms || backdrop-cms --version

2. UPGRADE to 1.28.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade backdrop-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade backdrop-cms

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 1.28.0 (Debian / Ubuntu)

apt-cache madison backdrop-cms sudo apt install backdrop-cms=<VERSION_BEFORE_1.28.0> sudo apt-mark hold backdrop-cms

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

dnf --showduplicates list backdrop-cms sudo dnf downgrade backdrop-cms-<VERSION_BEFORE_1.28.0> sudo dnf versionlock add backdrop-cms

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-2025-25062?

backdrop cms: upgrade to 1.28.5, 1.29.3. Exact commands for each OS are on this page.

Is CVE-2025-25062 being exploited?

CVE-2025-25062 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-2025-25062 affect?

CVE-2025-25062 affects backdrop cms. Severity is medium (CVSS 4.4). An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3. It doesn't sufficiently isolate long text content when the CKEditor 5 rich text editor is used. This allows a potential attacker to craft specialized

How urgent is CVE-2025-25062?

Priority 40/100. Public exploit reference

Related CVEs

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CVE-2025-25063 MEDIUM 4.4 UPGRADE An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3
CVE-2024-54123 MEDIUM 6.1 UPGRADE Backdrop CMS before 1.28.4 and 1.29.x before 1.29.2 allows XSS via an SVG document, if the SVG tag is allowed

References

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