Vulnerability · Published Oct 3, 2025 · Assigned by GitHub_M

CVE-2025-61681Kuno is Vulnerable to Stored XSS Attack via SVG File Upload

Medium 5.4

In plain English

A medium-severity cross-site scripting in kuno from xuemian168. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 84.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

KUNO CMS is a fully deployable full-stack blog application. Versions 1.3.13 and below contain validation flaws in its file upload functionality that can be exploited for stored XSS. The upload endpoint only validates file types based on Content-Type headers, lacks file content analysis and extension whitelist restrictions, allowing attackers to upload SVG files containing malicious scripts (disguised as images). When users access the uploaded resource pages, arbitrary JavaScript executes in their browsers. This issue is fixed in version 1.3.14.

Affected products (as reported)

Vendor	Product	Versions
xuemian168	kuno	< 1.3.14

Weakness: CWE-79, CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

https://github.com/xuemian168/kuno/security/advisories/GHSA-q3w2-2vqp-gx3r x_refsource_CONFIRM
https://github.com/xuemian168/kuno/commit/fc486b5c9091b607f82bf7b354d18f25204f7dc6 x_refsource_MISC
https://github.com/xuemian168/kuno/releases/tag/v1.3.14 x_refsource_MISC