TI-2023-05173 Aliases CVE-2023-5621 GHSA-7c84-qx75-c25g

Thumbnail Slider With Lightbox <= 1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via Image Title

LOW 23CWE-79Published 2023-10-18 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: High
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Image Title field in versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00482 41st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nik00726	Thumbnail Slider With Lightbox	up to 1.0	—	No fix listed	CNA

Thumbnail Slider With Lightbox Vendornik00726 Affected up to 1.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:i13websolution:thumbnail_slider_with_lightbox:1.0:::::wordpress::	1.0	Vulnerable	nik00726

cpe:2.3:a:i13websolution:thumbnail_slider_with_lightbox:1.0:*:*:*:*:wordpress:*:* Versions 1.0 Vulnerable ·nik00726

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2023-5621
2026-10-03 Alias added: GHSA-7c84-qx75-c25g

References

Advisory 1

https://www.wordfence.com/threat-intel/vulnerabilities/id/547c425d-8b0f-4e65-8b8a-c3a3059301fe?source=cve

Other 2

TI-2023-05356 Cross-site request forgery in nik00726 Thumbnail Slider With Lightbox CVSS 3.1CRITICAL 9.6
TI-2015-08074 Thumbnail Slider With Lightbox <= 1.0.4 - Authenticated (Admin+) SQL Injection CVSS 3.1MEDIUM 4.9
TI-2023-05089 Thumbnail Slider With Lightbox <= 1.0 - Cross-Site Request Forgery CVSS 3.1MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences