WP Discourse <= 2.5.9 - Authenticated (Author+) Information Exposure

Exposure of Sensitive Information to an Unauthorized Actor
CVE CVE-2025-11983
CVSS Medium (4.3)
Publicly Published October 31, 2025
Last Updated November 1, 2025
Researcher Jonas Benjamin Friedli
Description

The WP Discourse plugin for WordPress is vulnerable to Information Exposure in all versions up to, and including, 2.5.9. This is due to the plugin unconditionally sending Discourse API credentials (Api-Key and Api-Username headers) to any host specified in a post's discourse_permalink custom field during comment synchronization. This makes it possible for authenticated attackers, with author-level access and above, to exfiltrate sensitive Discourse API credentials to attacker-controlled servers, as well as query internal services and potentially perform further attacks.

References

1 affected software package

Software Type Plugin
Software Slug wp-discourse (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 2.5.9
Patched Version
  • 2.6.0
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