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)

Published 2025-04-20 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.002 (10.2th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Quasar Qmarkdown — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/quasarframework/quasar-ui-qmarkdown/commit/b61dff84851c45369cf931db5… (Patch)
github.com/quasarframework/quasar-ui-qmarkdown/compare/v2.0.4...v2.0.5 (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.