How to fix CVE-2025-43954?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Is Qmarkdown affected by CVE-2025-43954?

CVE-2025-43954 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 4.9. Attackers could inject scripts to steal sessions or perform actions as authenticated users. A patch is available and should be applied during regular vulnerability management.

Qmarkdown CVE-2025-43954

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-04-20 [email protected]

XSS Qmarkdown

4.9

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:37 vuln.today

Patch released

Mar 28, 2026 - 18:37 nvd

Patch available

CVE Published

Apr 20, 2025 - 19:15 nvd

MEDIUM 4.9

DescriptionNVD

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

AnalysisAI

QMarkdown (aka quasar-ui-qmarkdown) before 2.0.5 allows XSS via headers even when when no-html is set. Rated medium severity (CVSS 4.9), this vulnerability is remotely exploitable. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. QMarkdown (aka quasar-ui-qmarkdown) before 2.0.5 allows XSS via headers even when when no-html is set. Affected products include: Quasar Qmarkdown. Version information: before 2.0.5.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-43954 vulnerability details – vuln.today

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