XSS in Ultimate Before After Image Slider & Gallery

CVE-2025-15663

The Ultimate Before After Image Slider & Gallery WordPress plugin before 4.7.19 does not properly escape the slider's after-label value before its bundled client-side script re-injects it into the DOM, allowing users with the Author role and above to store a payload that executes in the browser of anyone (including an administrator) who views the slider.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (20.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-15663: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • Ultimate Before After Image Slider & Gallery

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-15663?
CVE-2025-15663 is a medium-severity vulnerability in Ultimate Before After Image Slider & Gallery, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-02.
How severe is CVE-2025-15663?
Medium severity. CVSS v3 base score is 6.8 out of 10.