CVE-2026-74793CWE-79cross-site-scripting

CVE-2026-74793

Medium · published August 23, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
15.4
In the wild
Unconfirmed
What it is

justhtml before 3.11.0 contains a cross-site scripting vulnerability where the default sanitizer bypasses event handler removal in selectedcontent projections. Attackers can inject SVG or MathML elements with event handlers that are cloned and reinserted into output without sanitization, enabling stored or reflected XSS attacks.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00250 · 15.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-23T18:16Z
References (3)
https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-gjf2-f4jc-69xf · [email protected]https://www.vulncheck.com/advisories/justhtml-before-xss-via-selectedcontent-projection · [email protected]https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-gjf2-f4jc-69xf · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 23 AUG 13:34Z
    justhtml before 3.11.0 XSS via selectedcontent projection
    cvelistv5