CVE-2026-15964Single Sign On For TNG <= 2.0.0 - Unauthenticated Privilege Escalation via Unverified Password Change
- 9.8CriticalCVSS base score
- 0.89%Exploitation in 30 daysEPSS · top 40% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Wordfence
- 16 days later
· 16 days later
Published
- 2 days later
· 2 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.89% · top 40% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
britcoder · Single Sign On For TNG
- affected ≤ 2.0.0
References
References6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1d8d393e-764c-491d-8afb-7d4f8d0c387a?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L120 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L102 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L69 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L96 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3624827%40single-sign-on-for-tng&new=3624827%40single-sign-on-for-tng (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-51789 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-15964)Record last updated .