CVE-2025-25063: An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3

Routine

MEDIUM 4.4UPGRADE

CVE-2025-25063 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 does not sufficiently validate uploaded SVG images to ensure they do not contain potentially dangerous SVG tags. SVG images can contain clickable links and executable scripting, and using a crafted SVG, it is possible to execute scripting in the browser when an SVG image is viewed. This issue is mitigated by the attacker needing to be able to upload SVG

Why this priority

No elevated risk signals yet

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	0.2% (top 90%)
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-2025-25063?

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

Is CVE-2025-25063 being exploited?

CVE-2025-25063 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-2025-25063 affect?

CVE-2025-25063 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 does not sufficiently validate uploaded SVG images to ensure they do not contain potentially dangerous SVG tags. SVG images can contain clickable

How urgent is CVE-2025-25063?

Priority 18/100. No elevated risk signals yet.

Related CVEs

CVE-2025-44141 MEDIUM 6.1 DOWNGRADE A Cross-Site Scripting (XSS) vulnerability exists in the node creation form of Backdrop CMS 1.30.
CVE-2025-63828 MEDIUM 6.1 DOWNGRADE Host Header Injection vulnerability in Backdrop CMS 1.32.1 allows attackers to manipulate the Host header in p
CVE-2025-25062 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

← Back to latest CVEs