Is CVE-2026-15013 actively exploited?

No active exploitation of CVE-2026-15013 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-15013 be exploited remotely?

Yes. CVE-2026-15013 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-15013?

CVE-2026-15013 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-15013

CWE-347Published: July 16, 2026· Updated: Jul 16, 2026

9.8

CVSS v3.1

EPSS:0.30%probability of exploitation in 30 daysPercentile:22.3th

Official 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.

NVD Source

Risk Analysis

This critical authentication bypass vulnerability in the SAML Single Sign On – SSO Login plugin for WordPress allows unauthenticated attackers to forge SAML assertions and take over any WordPress account, including administrator accounts. The flaw stems from the plugin's incorrect handling of SAML signature algorithms, enabling attackers to validate forged signatures. With a CVSS score of 9.8, this presents a severe risk of complete system compromise.

No public exploit is currently known for this vulnerability. Its remote exploitability and low attack complexity mean it could be easily exploited if a working exploit emerges.

Recommended Action

Users of the SAML Single Sign On – SSO Login plugin for WordPress should update to version 5.4.4 or later. Ensure all SAML configurations enforce strict signature algorithm validation.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-15013 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.