CVE-2026-6454Network attack vector

Stored DOM XSS via unescaped PDF href

Published Jul 24, 2026 · Updated Jul 24, 2026

Stored DOM XSS in Firelight Lightbox 2.3.20 and earlier allows remote authenticated users to inject scripts through crafted PDF links. The FancyBox V2 PDF beforeLoad callback generated in inc/fancybox-2.php concatenates this.href into an HTML string without escaping, so entity-encoded quotes escape a data attribute and create event handlers. Contributor-level access is required to store the link, and the injected script executes in a visitor's browser when the PDF link is clicked.

CVSS severity6.4
Medium
EPSS probability0.20%
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 DOM XSS in Firelight Lightbox 2.3.20 and earlier allows remote authenticated users to inject scripts through crafted PDF links. The FancyBox V2 PDF beforeLoad callback generated in inc/fancybox-2.php concatenates this.href into an HTML string without escaping, so entity-encoded quotes escape a data attribute and create event handlers. Contributor-level access is required to store the link, and the injected script executes in a visitor's browser when the PDF link is clicked.

The record

CVE
CVE-2026-6454
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
Firelight
Product
Firelight Lightbox
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2026Record 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=0 <=2.3.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Firelight · Firelight Lightboxversion=0 <=2.3.20

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')

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