What is CVE-2021-31550?

CVE-2021-31550 is a medium-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-04-22.

How severe is CVE-2021-31550?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in MediaWiki

CVE-2021-31550

An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (36.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/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 (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-31550?: CVE-2021-31550 is a medium-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-04-22.
How severe is CVE-2021-31550?: Medium severity. CVSS v3 base score is 5.4 out of 10.