How severe is CVE-2025-43954?

CVE-2025-43954 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-43954 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-43954?

CVE-2025-43954 affects Quasar Qmarkdown. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-43954?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-43954 have an EU (EUVD) identifier?

Yes. CVE-2025-43954 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11952.

When was CVE-2025-43954 published?

CVE-2025-43954 was published on 2025-04-20 and last updated on 2026-06-17.

CVE-2025-43954

CVE-2025-43954 is a medium-severity vulnerability in Quasar Qmarkdown with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-11952
Weakness: CWE-79
Affected product: Quasar Qmarkdown
Published: 2025-04-20
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-43954?: QMarkdown (aka quasar-ui-qmarkdown) before 2.0.5 allows XSS via headers even when when no-html is set.
How severe is CVE-2025-43954?: CVE-2025-43954 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-43954 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-43954?: CVE-2025-43954 affects Quasar Qmarkdown. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-43954?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-43954 have an EU (EUVD) identifier?: Yes. CVE-2025-43954 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11952.
When was CVE-2025-43954 published?: CVE-2025-43954 was published on 2025-04-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:quasar:qmarkdown:*:*:*:*:*:*:*:*

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