Security readout for executives and security teams
Plain-English summary
A vulnerable WordPress SAML SSO plugin can let an unauthenticated attacker log in as any WordPress user, including an administrator. The issue comes from trusting a signature algorithm value supplied inside the SAML response. That can turn identity-provider public-key validation into attacker-controlled HMAC validation.
Executive priority
Treat this as urgent for any WordPress site using the affected plugin. A successful attack could give full administrative control of the site without credentials.
Technical view
The plugin up to 5.4.3 reads the SAMLResponse SignatureMethod Algorithm and recasts the IdP RSA public key as an HMAC-SHA1 secret. This algorithm-confusion flaw can allow forged SAML assertions to pass validation and issue valid WordPress authentication cookies.
Likely exposure
Exposure is likely limited to WordPress sites using SAML Single Sign On – SSO Login versions up to and including 5.4.3, especially where SAML login is internet-accessible.
Exploitation context
The CVE describes unauthenticated remote account takeover with no user interaction. The source bundle does not show CISA KEV listing or confirmed active exploitation, so active exploitation should not be assumed.
Researcher notes
Evidence points to CWE-347 signature verification failure through algorithm confusion. The provided sources identify vulnerable code paths and a related changeset, but the bundle does not explicitly name a fixed version or confirmed exploitation.
Mitigation direction
- Identify all WordPress sites using the affected plugin.
- Check vendor or WordPress.org guidance for a fixed release beyond 5.4.3.
- Temporarily disable the plugin where update status cannot be confirmed.
- Review administrator accounts and active sessions after remediation.
- Rotate privileged WordPress credentials if compromise is suspected.
Validation and detection
- Inventory plugin name and version across WordPress environments.
- Confirm whether any site runs version 5.4.3 or earlier.
- Review SAML login exposure on public WordPress routes.
- Check logs for unexpected admin logins or new privileged users.
- Verify authentication behavior after applying vendor guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-347: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-15013 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9WordfenceVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineWordfence
Vendor Notified
- Source timelineWordfence
Disclosed
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/ee95092d-6351-4612-872d-284165bc1201?source=cveCVE reference, Wordfence
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-utilities.php#L444CVE reference, Wordfence
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/class-mo-saml-login-validate.php#L119CVE reference, Wordfence
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.3/includes/lib/SAML2Core/class-mo-saml-xml-security-key.php#L722CVE reference, Wordfence
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3601345%40miniorange-saml-20-single-sign-on&new=3601345%40miniorange-saml-20-single-sign-onCVE reference, Wordfence
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.