CVE-2026-15964: Single Sign On For TNG <= 2.0.0 - Unauthenticated Privilege Escalation via Unver

In plain English

A critical-severity security flaw in Single Sign On For TNG from britcoder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Official description

The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass via unauthenticated password reset in all versions up to, and including, 2.0.0. This is due to the `ssoprocess_ajax()` function — registered on `wp_ajax_nopriv_ssoprocess_ajax` and therefore reachable without authentication — accepting an attacker-supplied `email` parameter with the `setnewpassword` operation and calling `reset_password()` on the resolved account without any ownership token, email confirmation link, or capability check. The sole guard is a call to `check_ajax_referer()`, which provides no authorization barrier because the `ssoajaxnonce` nonce is publicly broadcast on every front-end page via `wp_localize_script()` into the `SSOPWDREQUIREMENT` JavaScript object; since WordPress computes nonces for logged-out visitors against a shared anonymous session context, any unauthenticated visitor can scrape a valid nonce from the homepage and use it to authenticate the request. This makes it possible for unauthenticated attackers to change the password of any WordPress account, including administrator accounts, enabling complete site takeover.

Vendor	Product	Versions
britcoder	Single Sign On For TNG	0 – through 2.0.0

Vendor

Product

Versions

britcoder

Single Sign On For TNG

0 – through 2.0.0

CVE-2026-15964Single Sign On For TNG <= 2.0.0 - Unauthenticated Privilege Escalation via Unverified Password Change

In plain English

Official description

Affected products (as reported)

References