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Vulnerability record · CVE-2026-19842 · published 19 August 2026

CVE-2026-19842: Improper authentication vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.26% · top 84.0% CWE-287 · Improper authentication Deferred
8.8CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
26 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

LinkTags
https://wpscan.com/vulnerability/7b79d86e-d3f8-4d4f-929b-fd00540cc00f/

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-19842), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.