CVE-2026-15964 Single Sign On For TNG <= 2.0.0 - Unauthenticated Privilege Escalation via Unverified Password Change
Unauthenticated attackers can reset any user's password, including administrators, by exploiting a publicly exposed nonce in the Single Sign On For TNG plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15964?
CVE-2026-15964 is a critical authentication bypass vulnerability in britcoder Single Sign On For TNG, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-620
Which versions are affected by CVE-2026-15964?
How do I fix CVE-2026-15964?
No fix has been published for CVE-2026-15964 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15964 being exploited?
There is no known exploitation of CVE-2026-15964 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-75h6-5h53-j8cq.