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Vulnerabilities

Vulnerability · CVE-2025-66520

A stored cross-site scripting (XSS) vulnerability exists in the Portfolio feature of the Foxit PDF Editor cloud (pdfonline.foxit.com).

Published Dec 19, 2025 · catalog updated Dec 19, 2025 · Foxit Software Inc.

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-66520. EPSS is 0.18%. Act only if a listed version of Foxit Software Inc. is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Version ranges on file
Affected products
vendor Foxit Software Inc. pdfonline.foxit.com before 2025‑12‑01

A stored cross-site scripting (XSS) vulnerability exists in the Portfolio feature of the Foxit PDF Editor cloud (pdfonline.foxit.com). User-supplied SVG files are not properly sanitized or validated before being inserted into the HTML structure. As a result, embedded HTML or JavaScript within a crafted SVG may execute whenever the Portfolio file list is rendered.

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 Foxit Software Inc. pdfonline.foxit.com before 2025‑12‑01before 2025‑12‑01

How to fix CVE-2025-66520

  • Upgrade

    CVE-2025-66520 lists a fix boundary at 2025‑12‑01. Compare the installed build with that boundary before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

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-2025-66520. EPSS is 0.18%. Act only if a listed version of Foxit Software Inc. is installed.

Which versions are affected?

Compare what you have installed with Foxit Software Inc. pdfonline.foxit.com before 2025‑12‑01 before 2025‑12‑01. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 19, 2025 · EUVD

    Detected

    A stored cross-site scripting (XSS) vulnerability exists in the Portfolio feature of the Foxit PDF Editor cloud (pdfonline.foxit.com). User-supplied SVG files are not properly sanitized or validated before being inserted into the HTML structure. As a result, embedded HTML or JavaScript within a crafted SVG may execute whenever the Portfolio file list is rendered.

  2. Dec 19, 2025 · EUVD

    Fix available

    Foxit Software Inc. pdfonline.foxit.com before 2025‑12‑01 fixed in 2025‑12‑01

  3. Dec 19, 2025 · EUVD

    Updated

    A stored cross-site scripting (XSS) vulnerability exists in the Portfolio feature of the Foxit PDF Editor cloud (pdfonline.foxit.com). User-supplied SVG files are not properly sanitized or validated before being inserted into the HTML structure. As a result, embedded HTML or JavaScript within a crafted SVG may execute whenever the Portfolio file list is rendered.

Sources

  • CVE.orgVulnerability recordCVE-2025-66520

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66520

    30-day exploitation probability 0.18%

    first.org
  • EUVDVulnerability recordEUVD-2025-204456

    A stored cross-site scripting (XSS) vulnerability exists in the Portfolio feature of the Foxit PDF Editor cloud (pdfonline.foxit.com). User-supplied SVG files are not properly sanitized or validated before being inserted into the HTML structure. As a result, embedded HTML or Java

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgNov 2, 2026
  • EUVDNov 1, 2026