CVE-2026-77998

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

miniOrange Security Software: IAM, PAM, IGA, MDM, DLP, Data Privacy & AI Security

https://www.miniorange.com/

Vendor Advisories for CVE-2026-77998(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 33× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-28 09:22 UTCGHSA enrichment
  2. 2026-08-28 05:33 UTCGHSA enrichment
  3. 2026-08-28 01:39 UTCGHSA enrichment
  4. 2026-08-27 21:55 UTCGHSA enrichment
  5. 2026-08-27 18:11 UTCEG score recompute
  6. 2026-08-27 18:11 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 14:22 UTCGHSA enrichment
  9. 2026-08-27 10:38 UTCGHSA enrichment
  10. 2026-08-27 06:54 UTCGHSA enrichment
  11. 2026-08-27 03:05 UTCGHSA enrichment
  12. 2026-08-26 23:21 UTCEG score recompute
  13. 2026-08-26 23:21 UTCGHSA enrichment
  14. 2026-08-26 23:10 UTCEG score recompute
  15. 2026-08-26 23:10 UTCGHSA enrichment
  16. 2026-08-26 20:44 UTCGHSA enrichment
  17. 2026-08-26 16:44 UTCEG score recompute
  18. 2026-08-26 16:44 UTCGHSA enrichment
  19. 2026-08-26 14:55 UTCEG score recompute
  20. 2026-08-26 14:55 UTCGHSA enrichment
  21. 2026-08-26 14:47 UTCEPSS rescore
  22. 2026-08-26 11:10 UTCGHSA enrichment
  23. 2026-08-26 07:24 UTCGHSA enrichment
  24. 2026-08-26 04:55 UTCEG score recompute
  25. 2026-08-26 04:55 UTCGHSA enrichment
Show 8 more
  1. 2026-08-26 02:33 UTCGHSA enrichment
  2. 2026-08-25 22:49 UTCGHSA enrichment
  3. 2026-08-25 19:06 UTCGHSA enrichment
  4. 2026-08-25 15:21 UTCEG score recompute
  5. 2026-08-25 15:15 UTCEG score recompute
  6. 2026-08-25 13:22 UTCEG score recompute
  7. 2026-08-25 12:52 UTCEG score recompute
  8. 2026-08-25 12:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77998?
CVE-2026-77998 is a critical vulnerability published on August 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 mosamlvalidatesignature()…
When was CVE-2026-77998 disclosed?
CVE-2026-77998 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77998 actively exploited?
CVE-2026-77998 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.4% of all scored CVEs.
What is the CVSS score of CVE-2026-77998?
CVE-2026-77998 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-77998?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77998, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-77998

Explore →

Is Your Infrastructure Affected by CVE-2026-77998?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs