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Vulnerabilities

Vulnerability · CVE-2025-39509

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeNcode TNC FlipBook pdf-viewer-for-wordpress allows Stored XSS.This issue

Published May 16, 2025 · catalog updated Apr 28, 2026 · ThemeNcode TNC FlipBook

Check if you run it

No confirmed exploitation is on record for CVE-2025-39509. EPSS is 0.26%. Act only if a listed version of ThemeNcode TNC FlipBook is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Advisory link
Affected products
vendor ThemeNcode TNC FlipBook 0 ≤12.1.0

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeNcode TNC FlipBook pdf-viewer-for-wordpress allows Stored XSS.This issue affects TNC FlipBook: from n/a through <= 12.1.0.

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 ThemeNcode TNC FlipBook 0 ≤12.1.00 ≤12.1.0

How to fix CVE-2025-39509

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-2025-39509. EPSS is 0.26%. Act only if a listed version of ThemeNcode TNC FlipBook is installed.

Which versions are affected?

Compare what you have installed with ThemeNcode TNC FlipBook 0 ≤12.1.0 0 ≤12.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. May 16, 2025 · EUVD

    Detected

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeNcode TNC FlipBook pdf-viewer-for-wordpress allows Stored XSS.This issue affects TNC FlipBook: from n/a through <= 12.1.0.

  2. Apr 28, 2026 · EUVD

    Updated

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeNcode TNC FlipBook pdf-viewer-for-wordpress allows Stored XSS.This issue affects TNC FlipBook: from n/a through <= 12.1.0.

Sources

  • CVE.orgVulnerability recordCVE-2025-39509

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-39509

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-15496

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeNcode TNC FlipBook pdf-viewer-for-wordpress allows Stored XSS.This issue affects TNC FlipBook: from n/a through <= 12.1.0.

    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.