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Findings

Vulnerability · CVE-2025-27337

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in kontur Fontsampler fontsampler allows Reflected XSS.This issue affects Fontsam

Published Apr 17, 2025 · corrected/updated Apr 28, 2026 · kontur Fontsampler · evidence confidence high

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in kontur Fontsampler fontsampler allows Reflected XSS.This issue affects Fontsampler: from n/a through <= 0.4.14.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2025-27337 is a high public vulnerability record for kontur Fontsampler. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether kontur Fontsampler is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: kontur Fontsampler 0 ≤0.4.14 (0 ≤0.4.14). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.1 (technical impact); EPSS 29.0% (30-day exploitation probability). It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: cve_org, euvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    A patch or advisory reference is linked. Open the original publisher for availability by product version.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

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

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 17, 2025 · EUVD

    Detected

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in kontur Fontsampler fontsampler allows Reflected XSS.This issue affects Fontsampler: from n/a through <= 0.4.14.

  2. Apr 28, 2026 · EUVD

    Updated

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in kontur Fontsampler fontsampler allows Reflected XSS.This issue affects Fontsampler: from n/a through <= 0.4.14.

Affected

  • vendor kontur Fontsampler 0 ≤0.4.140 ≤0.4.14

Sources

  • CVE.orgVulnerability recordCVE-2025-27337

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-11639

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in kontur Fontsampler fontsampler allows Reflected XSS.This issue affects Fontsampler: from n/a through <= 0.4.14.

    euvd.enisa.europa.eu

References