Vulnerabilities / Nexter Extension / WPSEC-2026-1081
Nexter Extension <= 4.7.12 - Authenticated (Author+) Missing Authorization to Image Conversion and Overwrite via Image Optimisation
Medium 4.3
CWE-862Fixed in 4.7.13
- ID
- WPSEC-2026-1081
- Plugin
- Nexter Extension – Security, Performance, Code Snippets & Site Toolkit (nexter-extension)
- Affected
- from 4.6.0 before 4.7.13
- Remediation
- Update to 4.7.13 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-10-16
- Attack surface
- Nexter Extension on WPSec AttackSurface
- Fix released
- Published
Description
The Nexter Extension plugin for WordPress is vulnerable to unauthorized modification of data via the Image Optimisation 'nxt_ext_image_convert_attachment' AJAX action in versions 4.6.0 to 4.7.12. This is due to the function checking only the upload_files capability and not checking that the user may edit the attachment being converted. This makes it possible for authenticated attackers with Author-level access and above to convert media library images that belong to other users, which replaces the files served for those images and rewrites their attachment metadata.
References
- https://wpsec.com/vuln/WPSEC-2026-1081/
- https://plugins.svn.wordpress.org/nexter-extension/tags/4.7.13/
- https://wordpress.org/plugins/nexter-extension/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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