CVE-2020-15179

HTML Injection in ScratchSig

CRITICAL
9
CVSS Score
Published: September 15, 2020 at 06:10 PM UTC
Updated: June 17, 2026 at 02:56 AM UTC
2 products affected across 2 vendorsScratchsigWiki Scratchsig

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Severity
CRITICAL9
Exploit prediction
EPSS 1%

Description

The ScratchSig extension for MediaWiki before version 1.0.1 allows stored Cross-Site Scripting. Using <script> tag inside <scratchsig> 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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.0.1
Affected range stops below 1.0.1, so it looks safe — our inference, not a vendor statement
v < 1.0.1
Affected range stops below 1.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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