Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M
CVE-2026-30977RenderBlocking has Stored XSS in renderblocking-css with Inline Assets mode
Low 2.0
In plain English
A low-severity cross-site scripting in RenderBlocking from lihaohong6. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Severity (CVSS 4.0)2.0Low
Exploit odds (30 days)0.5%top 53.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| lihaohong6 | RenderBlocking | < 0.1.1 |
Weakness: CWE-79 · 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