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Vulnerabilities

Vulnerability · CVE-2025-43954

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

Published Apr 20, 2025 · catalog updated Apr 21, 2025 · Quasar QMarkdown

Check if you run it

No confirmed exploitation is on record for CVE-2025-43954. EPSS is 0.21%. Act only if a listed version of Quasar QMarkdown is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Version ranges on file
Affected products
vendor Quasar QMarkdown 0 <2.0.5

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Quasar QMarkdown 0 <2.0.50 <2.0.5

How to fix CVE-2025-43954

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-43954. EPSS is 0.21%. Act only if a listed version of Quasar QMarkdown is installed.

Which versions are affected?

Compare what you have installed with Quasar QMarkdown 0 <2.0.5 0 <2.0.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 20, 2025 · EUVD

    Detected

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

  2. Apr 21, 2025 · EUVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2025-43954

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-43954

    30-day exploitation probability 0.2%

    first.org
  • EUVDVulnerability recordEUVD-2025-11952

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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.