What is CVE-2025-43954?

CVE-2025-43954 is a medium-severity vulnerability in Quasar Qmarkdown, classified under Cross-site Scripting. CVSS score: 4.9/10. Published 2025-04-20.

How severe is CVE-2025-43954?

Medium severity. CVSS v3 base score is 4.9 out of 10.

XSS in Quasar Qmarkdown

CVE-2025-43954

QMarkdown (aka quasar-ui-qmarkdown) before 2.0.5 allows XSS via headers even when when no-html is set.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Quasar Qmarkdown — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org (Patch)
cve@mitre.org (Patch, Release Notes)

Frequently asked questions

What is CVE-2025-43954?: CVE-2025-43954 is a medium-severity vulnerability in Quasar Qmarkdown, classified under Cross-site Scripting. CVSS score: 4.9/10. Published 2025-04-20.
How severe is CVE-2025-43954?: Medium severity. CVSS v3 base score is 4.9 out of 10.