CVE-2025-3862: Contest Gallery <= 26.0.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via id Parameter
Description
Contest Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘id’ parameter in all versions up to, and including, 26.0.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Classification
CVE ID: CVE-2025-3862
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.4
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Problem Types
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Affected Products
Vendor: contest-gallery
Product: Photos, Files, YouTube, Twitter, Instagram, TikTok, Ecommerce Contest Gallery – Upload, Vote, Sell via PayPal or Stripe, Social Share Buttons
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 10.56% (scored less or equal to compared to others)
EPSS Date: 2025-06-06 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-3862https://www.wordfence.com/threat-intel/vulnerabilities/id/a1b043a1-7bee-4ef0-86d9-19cf202cfc71?source=cve
https://www.contest-gallery.com/documentation/
https://plugins.trac.wordpress.org/browser/contest-gallery/tags/26.0.5/shortcodes/cg_entry_on_off.php#L20
https://wordpress.org/plugins/contest-gallery/#developers
https://plugins.trac.wordpress.org/changeset/3288915
https://plugins.trac.wordpress.org/browser/contest-gallery/tags/26.0.7/shortcodes/cg_entry_on_off.php#L20