CVE-2025-13904Network attack vector

Contributor-level stored XSS via unescaped shortcode attributes

Published Dec 12, 2025 · Updated Dec 12, 2025

Stored XSS in lesion WPGancio 1.12 and earlier allows remote authenticated users to execute scripts through gancio-event attributes. The gancio-event shortcode handler places user-supplied attributes into generated event markup without sufficient sanitization or context-appropriate output escaping. Contributor-level access permits payload storage, and the script runs in the browser of any user who opens the injected page.

CVSS severity6.4
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in lesion WPGancio 1.12 and earlier allows remote authenticated users to execute scripts through gancio-event attributes. The gancio-event shortcode handler places user-supplied attributes into generated event markup without sufficient sanitization or context-appropriate output escaping. Contributor-level access permits payload storage, and the script runs in the browser of any user who opens the injected page.

The record

CVE
CVE-2025-13904
Published
Dec 12, 2025
Updated
Dec 12, 2025
Vendor
lesion
Product
WPGancio
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=1.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

lesion · WPGancioversion=* <=1.12

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo