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…

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.20% · top 90% of all CVEs (7 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.4.

Weakness

• CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') (opens in a new tab)All about CWE-79 and its CVEs

Affected products

• backdropcms · backdrop

  • affected 1.28.0 – < 1.28.5
  • affected 1.29.0 – < 1.29.3

References (1)

• https://backdropcms.org/security/backdrop-sa-core-2025-002 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-25063](https://trackcve.app/badge/CVE-2025-25063.svg)](https://trackcve.app/cve/CVE-2025-25063)

Record last updated 12 Feb 2025, 20:41 UTC.