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Vulnerabilities

Vulnerability · CVE-2025-25173

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FasterThemes FastBook fastbook-responsive-appointment-booking-and-scheduling-s

Published Jun 27, 2025 · catalog updated Apr 28, 2026 · FasterThemes FastBook

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-25173. EPSS is 0.25%. Act only if a listed version of FasterThemes FastBook is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Advisory link
Affected products
vendor FasterThemes FastBook 0 ≤1.1

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FasterThemes FastBook fastbook-responsive-appointment-booking-and-scheduling-system allows Stored XSS.This issue affects FastBook: from n/a through <= 1.1.

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 FasterThemes FastBook 0 ≤1.10 ≤1.1

How to fix CVE-2025-25173

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-2025-25173. EPSS is 0.25%. Act only if a listed version of FasterThemes FastBook is installed.

Which versions are affected?

Compare what you have installed with FasterThemes FastBook 0 ≤1.1 0 ≤1.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.25%. 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.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 27, 2025 · EUVD

    Detected

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FasterThemes FastBook fastbook-responsive-appointment-booking-and-scheduling-system allows Stored XSS.This issue affects FastBook: from n/a through <= 1.1.

  2. Apr 28, 2026 · EUVD

    Updated

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FasterThemes FastBook fastbook-responsive-appointment-booking-and-scheduling-system allows Stored XSS.This issue affects FastBook: from n/a through <= 1.1.

Sources

  • CVE.orgVulnerability recordCVE-2025-25173

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-25173

    30-day exploitation probability 0.25%

    first.org
  • EUVDVulnerability recordEUVD-2025-19263

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FasterThemes FastBook fastbook-responsive-appointment-booking-and-scheduling-system allows Stored XSS.This issue affects FastBook: from n/a through <= 1.1.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 24, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 18, 2026