CVE-2026-6809 is a stored cross-site scripting vulnerability in the dartiss Social Post Embed WordPress plugin, specifically in the Threads embed handler. The issue is caused by improper neutralization of input during web page generation, allowing authenticated users with Contributor-level permissions or higher to inject arbitrary scripts via a user-supplied URL. These scripts execute in the context of any user who accesses the injected page, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to 2.0.1. The CVSS 3.1 base score is 6.4, with network attack vector, low attack complexity, privileges required at the low level, no user interaction needed, and impacts on confidentiality and integrity but not availability.

Successful exploitation allows authenticated contributors or higher to inject persistent malicious scripts into pages viewed by other users, potentially compromising user sessions or data confidentiality and integrity. The vulnerability does not affect availability. There are no reports of active exploitation in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or removing the Social Post Embed plugin if possible to reduce risk.