Firelight Lightbox <= 2.3.20 — Authenticated (Contributor+) Stored DOM Cross-Site Scripting via PDF beforeLoad 'href' Attribute
CVE-2026-6454Published · Updated Action summary
Affected: ≤2.3.20Update to 2.3.21 or newer
All remediation steps- Severity
- Medium6.4
- CVSS
- 6.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Firelight Lightbox easy-fancybox
- Affected≤ 2.3.20
- Patched in2.3.21
Update to 2.3.21 or newer.
You are affected if you run ≤ 2.3.20. Version 2.3.21 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Firelight Lightbox.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 2.3.21, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Firelight Lightbox to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Quốc Huy (jtwings).
The Firelight Lightbox plugin for WordPress is vulnerable to Stored DOM Cross-Site Scripting in versions up to and including 2.3.20. This is due to insufficient sanitization of the href attribute value within the FancyBox V2 PDF beforeLoad JavaScript callback generated in inc/fancybox-2.php, where this.href is string-concatenated directly into an HTML string without escaping, allowing a stored href containing entity-encoded double-quotes to break out of the data attribute and inject arbitrary event handlers into the DOM. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user clicks the malicious PDF link.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Firelight Lightbox
All 9| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.3.23Update to 2.3.24 | CVE-2026-118438 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.3.22Update to 2.3.23 | CVE-2026-118165 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.3.16Update to 2.3.17 | CVE-2025-52707 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.3.15Update to 2.3.16 | CVE-2025-5035 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤2.3.14Update to 2.3.15 | CVE-2025-3597 |
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.3.23Update to 2.3.24
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.3.22Update to 2.3.23
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.3.16Update to 2.3.17
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.3.15Update to 2.3.16
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤2.3.14Update to 2.3.15
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 6.4
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.