# Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery <= 4.5.4 - Authenticated (Author+) Missing Authorization to Gallery Image Metadata Modification

- **ID:** WPSEC-2026-2134
- **Plugin:** Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery (`nextgen-gallery`), https://wordpress.org/plugins/nextgen-gallery/
- **Affected versions:** all versions before 4.5.5
- **Fixed in:** 4.5.5 (Update to 4.5.5 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-30)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/nextgen-gallery
- **Fix released:** 2026-10-29
- **Published:** 2026-10-30
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2134/

## Description

The NextGEN Gallery plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 4.5.4. This is due to a missing capability and ownership check in the NextGEN media upload tab's save handler, which only verified a nonce printed for any user with the upload_files capability. This makes it possible for authenticated attackers, with Author-level access and above, to overwrite the slug, alt text and description of any NextGEN Gallery image on the site, including images in other users' galleries.

## References

- https://wpsec.com/vuln/WPSEC-2026-2134/
- https://plugins.svn.wordpress.org/nextgen-gallery/tags/4.5.5/
- https://wordpress.org/plugins/nextgen-gallery/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2134/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.