Link Whisper Free <= 0.9.7 - Authenticated (Contributor+) PHP Object Injection via Link Whisper Post Meta
- ID
- WPSEC-2026-0867
- Plugin
- Link Whisper Free (link-whisper)
- Affected
- all versions before 0.9.8
- Remediation
- Update to 0.9.8 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-502
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-13
- Attack surface
- Link Whisper Free on WPSec AttackSurface
- Fix released
- Published
Description
The Link Whisper Free plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 0.9.7 via deserialization of the plugin's stored link data meta, which was passed to maybe_unserialize() without restricting the allowed classes and was not protected from generic custom field editing. This makes it possible for authenticated attackers with Contributor-level access and above, who can edit post meta on their own posts, to inject a PHP object. No known POP chain is present in the plugin itself; if a POP chain is present via another installed plugin or theme, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
References
- https://wpsec.com/vuln/WPSEC-2026-0867/
- https://plugins.svn.wordpress.org/link-whisper/tags/0.9.8/
- https://wordpress.org/plugins/link-whisper/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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