PatchTheCVECVE-2025-39509: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeNco
CVE-2025-39509 is a medium-severity flaw (CVSS 6.5) affecting tnc flipbook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 82%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2025-05-16 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-39509?
tnc flipbook: upgrade to newer than 12.1.0. Exact commands for each OS are on this page.
Is CVE-2025-39509 being exploited?
CVE-2025-39509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-39509 affect?
CVE-2025-39509 affects tnc flipbook. Severity is medium (CVSS 6.5). 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.
How urgent is CVE-2025-39509?
Priority 27/100. No elevated risk signals yet.