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.
Published 2020-09-15 18:15:14
Updated 2020-09-22 17:05:28
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: Cross site scripting (XSS)Gain privilege

Exploit prediction scoring system (EPSS) score for CVE-2020-15179

0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-15179

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.6
MEDIUM AV:N/AC:H/Au:S/C:P/I:P/A:P
3.9
6.4
NIST
9.0
CRITICAL CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
2.3
6.0
NIST
8.0
HIGH CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
1.3
6.0
GitHub, Inc.

CWE ids for CVE-2020-15179

References for CVE-2020-15179

Products affected by CVE-2020-15179

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