CVE-2026-30977CWE-79

RenderBlocking has Stored XSS in renderblocking-css with Inline Assets mode

Low · published March 10, 2026

CVSS v4.0
2.0
EPSS
1%
Percentile
42.8
In the wild
Unconfirmed
What it is

RenderBlocking is a MediaWiki extension that allows interface administrators to specify render-blocking CSS and JavaScript. Prior to 0.1.1, there is Stored XSS in renderblocking-css with Inline Assets mode. $wgRenderBlockingInlineAssets = true and editsitecss user rights are required. This vulnerability is fixed in 0.1.1.

The record
Technical detail
CVSS v4.0
2.0 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00512 · 42.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-10T17:40Z
EPSS history
Timeline
  • 10 MAR 17:40Z
    RenderBlocking has Stored XSS in renderblocking-css with Inline Assets mode
    cvelistv5