Answer in brief
CVE-2026-77998 records a Critical severity (CVSS 10.0) vulnerability in Joomla Extension - miniorange.com - Unauthenticated Authentication Bypass via SAMLResponse Parameter in miniOrange SAML SSO < 11.0.2, SAML SP Single Sign On – Login with ADFS < 6.4, SAML SP Single Sign On – SAML SSO login with Google Apps < 6.4. The current sources do not mark it as known exploited. The current feed maps miniorange.com/Login with Keycloak OAuth Single Sign-On (SSO) (generic), miniorange.com/OAuth Single Sign-On – OIDC SSO | Login with Azure AD (generic), miniorange.com/SAML SP Single Sign On – Login with ADFS extension for Joomla (generic), miniorange.com/SAML SSO Basic for Joomla extension for Joomla (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 10.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps miniorange.com/Login with Keycloak OAuth Single Sign-On (SSO) (generic), miniorange.com/OAuth Single Sign-On – OIDC SSO | Login with Azure AD (generic), miniorange.com/SAML SP Single Sign On – Login with ADFS extension for Joomla (generic), miniorange.com/SAML SSO Basic for Joomla extension for Joomla (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| miniorange.com/Login with Keycloak OAuth Single Sign-On (SSO)generic | 1.0.0-1.2.1 | Not reported |
| miniorange.com/OAuth Single Sign-On – OIDC SSO | Login with Azure ADgeneric | 1.0.0-1.2.1 | Not reported |
| miniorange.com/SAML SP Single Sign On – Login with ADFS extension for Joomlageneric | 1.0.0-6.3.0 | Not reported |
| miniorange.com/SAML SSO Basic for Joomla extension for Joomlageneric | 1.0.0-13.1.0 | Not reported |
| miniorange.com/SAML SSO Enterprise for Joomla extension for Joomlageneric | 1.0.0-44.1.0 | Not reported |
| miniorange.com/SAML SSO for Joomla extension for Joomlageneric | 1.0.0-11.0.1 | Not reported |
| miniorange.com/SAML SSO Free for Joomla extension for Joomlageneric | 1.0.0-11.0.1 | Not reported |
| miniorange.com/SAML SSO login with Google Apps extension for Joomlageneric | 1.0.0-6.3.0 | Not reported |
| miniorange.com/SAML SSO Premium for Joomla extension for Joomlageneric | 1.0.0-34.1.0 | Not reported |
| miniorange.com/SAML SSO Standard for Joomla extension for Joomlageneric | 1.0.0-24.1.0 | Not reported |
| miniorange.com/Single Sign-On for Educational Institutes - versiongeneric | 1.0.0-1.2.1 | Not reported |
Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 25, 2026
Joomla Extension - miniorange.com - Unauthenticated Authentication Bypass via SAMLResponse Parameter in miniOrange SAML SSO < 11.0.2, SAML SP Single Sign On – Login with ADFS < 6.4, SAML SP Single Sign On – SAML SSO login with Google Apps < 6.4 - 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 Joomla user, including administrators, by submitting a crafted SAMLResponse containing an attacker-controlled NameID and a deliberately malformed signature value that triggers an OpenSSL processing error — bypassing verification entirely and resulting in wp_set_auth_cookie() being called for the targeted account.
Quoted source text, attributed separately from HOL analysis.