CVE-2026-30977

2.0 lowEPSS 0.5%

Low (2.0). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

2.0 low

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: 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-03-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://github.com/lihaohong6/RenderBlocking/commit/096fc47dad9dca153b02cba3db81f412c87fb2be
https://github.com/lihaohong6/RenderBlocking/releases/tag/v0.1.1
https://github.com/lihaohong6/RenderBlocking/security/advisories/GHSA-4h5r-8rjm-496r

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