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Vulnerabilities

Vulnerability · CVE-2026-15981

MiniOrange saml_sp_single_sign_on Improper Authentication

Published Aug 21, 2026 · catalog updated Aug 21, 2026 · MiniOrange

Patch now

CVE-2026-15981 is in the CISA known-exploited catalog. Confirm MiniOrange against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.88%
Remediation
Remediation guidance
Affected products
stated saml_sp_single_sign_on · vendor MiniOrange saml_sp_single_sign_on

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.4.4. This is due to the mo_saml_validate_signature() function performing a loose boolean check on the raw tri-state integer returned by PHP's openssl_verify(), causing an error return value of -1 to be evaluated as truthy and therefore treated as a successful signature verification. This makes it possible for unauthenticated attackers to log in as any existing WordPress user, including administrators, by submitting a crafted SAMLResponse containing an attacker Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated saml_sp_single_sign_on<= 5.4.4
  • vendor MiniOrange saml_sp_single_sign_onversion unspecified

How to fix CVE-2026-15981

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-15981 is in the CISA known-exploited catalog. Confirm MiniOrange against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with <= 5.4.4. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 1.88%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 21, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Aug 21, 2026 · Patchstack Database

    Detected

    CVE-2026-15981 is listed by One slug, seven editions: the miniOrange SAML SSO bug that let anyone log in as your WordPress admin.

Sources

  • CVE.orgVulnerability recordCVE-2026-15981

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-15981

    30-day exploitation probability 1.9%

    first.org
  • Patchstack DatabaseVendor advisoryCVE-2026-15981

    Reported by the DigitalOcean security team, with root cause analysis by DigitalOcean, coverage and vendor follow-up handled jointly with Patchstack. Most vulnerability write-ups are about the bug. This is primarily about everything around the bug, where the actual risk ended up l

    patchstack.com
  • VulnCheck KEVConfirmed exploitationCVE-2026-15981

    The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.4.4. This is due to the mo_saml_validate_signature() function performing a loose boolean check on the raw tri-state integer returned by PHP's op

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.