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Two CVSS 9.8 Auth Bypasses in miniOrange SAML WordPress Plugin Were Exploited Before Any Database Even Listed the Paid Editions as Vulnerable

Attackers actively exploit two CVSS 9.8 auth bypasses (CVE-2026-61979, CVE-2026-15981) in the miniOrange SAML WordPress plugin, forging SAML responses to become admin.

CVE-2026-61979 is a SAML algorithm confusion flaw that lets attackers sign forged assertions using the identity provider's RSA public key as an HMAC secret; CVE-2026-15981 stems from PHP treating openssl_verify()'s -1 error return as true, allowing a crafted signature that triggers an OpenSSL error to validate. Both bugs independently let unauthenticated attackers obtain WordPress administrator sessions and both are confirmed exploited in the wild. DigitalOcean discovered the exploitation via a network anomaly after public vulnerability databases covered only the Free edition (fixed in 5.4.5), leaving seven independently versioned paid editions appearing patched. Attackers are scanning SSO endpoints from six IPs in Belgium, Nigeria, the US and Germany, and paid-edition fixes require manual uploads across version lines.

Security Affairs · 21d agoExploit / PoC in the wildCVE-2026-61979CVE-2026-15981

Related CVEs

  • CVE-2026-159819.8<1%
    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.
    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…
    · WordPress—
  • CVE-2026-619798.1<1%
    Unauthenticated privilege escalation in miniOrange SAML SSO WordPress plugin
    CVE-2026-61979 is an unauthenticated privilege-escalation flaw (CWE-266, incorrect assignment of privileges) in the miniOrange 'SAML SP Single Sign On' plugin for WordPress, affecting every version up to and including 5.4.3. Because it is reachable over the network with no privileges required and no user interaction (the CVSS 3.1 vector rates attack complexity as high), a remote attacker can abuse the plugin's SAML single sign-on handling to gain WordPress administrator-level privileges without valid credentials. With administrator access, an attacker can modify content, install plugins or themes, create rogue admin accounts, and use the site as a foothold. Any WordPress site running the affected versions is exposed, and reporting indicates the plugin's paid editions were also vulnerable to related flaws in the same campaign. No public proof-of-concept is known for this specific flaw and it is not in CISA KEV (EPSS ~0.3% over 30 days), but two separate CVSS 9.8 authentication-bypass flaws in the same plugin were exploited in the wild before they were even catalogued, and attackers are actively targeting miniOrange SAML flaws that grant WordPress admin access.
    · miniOrange SAML SP Single Sign On (WordPress plugin) <= 5.4.3 · miniOrange SAML SP Single Sign On - paid/premium editions (reported alongside the actively exploited related flaws)large

Appears with

organization Patchstack 1product miniOrange SAML 2.0 Single Sign On 1vendor miniOrange 1vendor WordPress 1
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