What is CVE-2021-30458?

CVE-2021-30458 is a medium-severity vulnerability in Wikimedia Parsoid, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-09.

How severe is CVE-2021-30458?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Wikimedia Parsoid

CVE-2021-30458

An issue was discovered in Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2. An attacker can send crafted wikitext that Utils/WTUtils.php will transform by using a <meta> tag, bypassing sanitization steps, and potentially allowing for XSS.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.010 (58.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Wikimedia Parsoid
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org (x_refsource_MISC, Issue Tracking, Vendor Advisory)
cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)

Frequently asked questions

What is CVE-2021-30458?: CVE-2021-30458 is a medium-severity vulnerability in Wikimedia Parsoid, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-09.
How severe is CVE-2021-30458?: Medium severity. CVSS v3 base score is 6.1 out of 10.