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CVE-2026-25100: Stored XSS via SVG File Upload in Bludit

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-27 · updated 2026-06-17
• Weakness: CWE-79

Description

Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its image upload functionality. An authenticated attacker with content upload privileges (such as Author, Editor, or Administrator) can upload an SVG file containing a malicious payload, which is executed when a victim visits the URL of the uploaded resource. The uploaded resource itself is accessible without authentication. The vendor was notified early about this vulnerability, but stopped responding in the middle of coordination. All versions up to 3.18.2 are considered to be vulnerable, future versions might also be vulnerable.

Affected products

• Bludit: before 3.18.2 — fixed in 3.18.2

How to fix

Upgrade to a fixed version: Bludit 3.18.2. Check the vendor advisory for mitigations.

References

• https://cert.pl/posts/2026/03/CVE-2026-25099
• https://github.com/bludit/bludit/releases/tag/3.18.2

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