CVE-2026-4559Network attack vector

Stored XSS via unescaped delay shortcode attribute

Published Aug 22, 2026 · Updated Aug 22, 2026

Stored XSS in WPChill Image Photo Gallery Final Tiles Grid 3.6.12 and earlier lets remote authenticated users inject scripts via delay. The shortcode renderer in lib/gallery-class.php places the untrusted delay attribute into generated page output without sufficient sanitization or output escaping. Contributor-level access is required, and the stored script executes in the browser of any user who opens the injected page.

CVSS severity6.4
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WPChill Image Photo Gallery Final Tiles Grid 3.6.12 and earlier lets remote authenticated users inject scripts via delay. The shortcode renderer in lib/gallery-class.php places the untrusted delay attribute into generated page output without sufficient sanitization or output escaping. Contributor-level access is required, and the stored script executes in the browser of any user who opens the injected page.

The record

CVE
CVE-2026-4559
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
WPChill
Product
Image Photo Gallery Final Tiles Grid
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=3.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPChill · Image Photo Gallery Final Tiles Gridversion=0 <=3.6.12

Published CVSS scores

6.4INCIBE-CERTCVSS: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.

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Technologies

Your stack

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Your stack

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