Unauthenticated admin account takeover via SAML signature bypass in a widely used Joomla SSO extension; remote full compromise risk across many Joomla deployments.
CVE-2026-77998
Unauthenticated SAML signature bypass in miniOrange Joomla SSO enabling admin logins.
Is CVE-2026-77998 being exploited?
Not confirmed. CVE-2026-77998 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-77998?
CVE-2026-77998 is rated Critical. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-77998?
Yes. A fix has been recorded for CVE-2026-77998. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77998 affect?
CVE-2026-77998 affects miniOrange SAML SSO for Joomla (< 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), Joomla sites using above miniOrange extensions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77998?
Upgrade to patched versions (>=11.0.2 or >=6.4); if unavailable disable plugin and rotate admin credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can bypass SAML signature verification and log in as any existing Joomla user, including administrators, achieving full site takeover.
Immediate action required
- affected1.0.0-6.3.0
- affected1.0.0-13.1.0
- affected1.0.0-44.1.0
- affected1.0.0-11.0.1
- affected1.0.0-6.3.0
- affected1.0.0-34.1.0
- affected1.0.0-24.1.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.