XSS in Backdropcms Backdrop
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. 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 images, and that Backdrop embeds all uploaded SVG images within <img> tags, which prevents scripting from executing. The SVG must be viewed directly by its URL in order to run any embedded scripting.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Backdropcms Backdrop — versions 1.28.0, 1.29.0
- Backdropcms Backdrop Cms
Weakness classification (CWE)
Public proof-of-concept exploits
References
- backdropcms.org/security/backdrop-sa-core-2025-002 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-25063?
- CVE-2025-25063 is a medium-severity vulnerability in Backdropcms Backdrop, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2025-02-03.
- How severe is CVE-2025-25063?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2025-25063 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.