What is CVE-2021-42042?

CVE-2021-42042 is a medium-severity vulnerability in Mediawiki, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-10-06.

How severe is CVE-2021-42042?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Mediawiki

CVE-2021-42042

An issue was discovered in SpecialEditGrowthConfig in the GrowthExperiments extension in MediaWiki through 1.36.2. The growthexperiments-edit-config-error-invalid-title MediaWiki message was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (41.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

Affected products

Mediawiki
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org (Patch, x_refsource_MISC, Issue Tracking, Vendor Advisory)
cve@mitre.org (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-42042?: CVE-2021-42042 is a medium-severity vulnerability in Mediawiki, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-10-06.
How severe is CVE-2021-42042?: Medium severity. CVSS v3 base score is 4.8 out of 10.