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Findings

Vulnerability · CVE-2026-15981

MiniOrange saml_sp_single_sign_on Improper Authentication

Published Aug 21, 2026 · corrected/updated Aug 21, 2026 · MiniOrange saml_sp_single_sign_on · evidence confidence very high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-15981 is a unknown public vulnerability record for MiniOrange saml_sp_single_sign_on. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether MiniOrange saml_sp_single_sign_on is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: MiniOrange saml_sp_single_sign_on. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: EPSS 1.9%. CISA lists it as known exploited. Sources contributing to this record: cve_org, epss, patchstack, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Confirmed in CISA KEV since Aug 21, 2026. Listed in CISA KEV and VulnCheck KEV.

  • Patch and remediation

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

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Technology hubs

WordPress

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.

Affected

  • vendor MiniOrange saml_sp_single_sign_onversion unspecified

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