High severity8.0NVD Advisory· Published Sep 15, 2020· Updated Jun 17, 2026

CVE-2020-15179

Description

The ScratchSig extension for MediaWiki before version 1.0.1 allows stored Cross-Site Scripting. Using tag inside tag, attackers with edit permission can execute scripts on visitors' browser. With MediaWiki JavaScript API, this can potentially lead to privilege escalation and/or account takeover. This has been patched in release 1.0.1. This has already been deployed to all Scratch Wikis. No workarounds exist other than disabling the extension completely.

Affected products

Scratch Wiki/Scratchsig
cpe:2.3:a:scratch-wiki:scratchsig:*:*:*:*:*:mediawiki:*:*
Range: <1.0.1
InternationalScratchWiki/ScratchSigcpe-rescue
Range: < 1.0.1
MediaWiki/ScratchSigllm-create
Range: <1.0.1

Patches

Vulnerability mechanics

References

github.com/InternationalScratchWiki/wiki-scratchsig/commit/4160a39a20eebeb63a59eb7597a91b961eca6388nvdPatchThird Party Advisory
github.com/InternationalScratchWiki/wiki-scratchsig/security/advisories/GHSA-gp9v-pg9f-vmp6nvdThird Party Advisory

News mentions

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cvss	0.520
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000