$ cve CVE-2026-15013 JSON

CVE-2026-15013 EXPLOIT

9.8

CRITICAL · CVSS 3.1 · EPSS 1.5% (pctl 73)

Patch early

A public exploit exists.

Description

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because `Mo_SAML_Utilities::mo_saml_cast_key()` reads the `SignatureMethod` Algorithm attribute directly from the attacker-controlled `SAMLResponse` parameter rather than enforcing the locally configured algorithm, causing the plugin to recast the IdP's RSA public key as an HMAC-SHA1 shared secret and validate the forged signature against it. This makes it possible for unauthenticated attackers to forge a SAML assertion targeting any WordPress account — including administrators — obtain valid WordPress authentication cookies, and achieve full administrator-level account takeover.

Scoring

CVSS	9.8 (CRITICAL, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS	1.5% — more likely to be exploited than 73% of all CVEs
Weakness	CWE-347
On CISA KEV	no
Public exploit	yes
Published	2026-07-16
Last modified	2026-08-07

Public exploits

Source	Title	Date
exploit-db	miniOrange 5.4.3 - Unauthenticated Auth Bypass	2026-09-01

References

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