CVE-2026-19842 SAML Single Sign On 4.8.85 - 5.4.6 - Unauthenticated Administrator Account Takeover via SAML Trust Anchor Overwrite
Unauthenticated attackers can overwrite SAML trust anchors to authenticate as any user, including administrators, in the SAML Single Sign On WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-19842?
CVE-2026-19842 is a high-severity authentication bypass vulnerability in Unknown SAML Single Sign On, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The SAML Single Sign On WordPress plugin before 5.4.7 does not verify the signature of a SAML response before storing the certificate it carries, and offers an administrator a one-click control that promotes that stored certificate to the site's trusted signing certificate, allowing unauthenticated attackers to have a certificate of their own trusted and then authenticate as any user, including an administrator.
Weakness: CWE-287
Which versions are affected by CVE-2026-19842?
How do I fix CVE-2026-19842?
No fix has been published for CVE-2026-19842 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-2026-19842 being exploited?
There is no known exploitation of CVE-2026-19842 in the wild and no public exploit code.
Sources
Also known as GHSA-qj54-25r3-fmh2.