GHSA-6423-85cc-8gf6 — joomla/joomla-cms
HIGHGHSA-6423-85cc-8gf6 is a high-severity (CVSS 7.5) Improper Authentication vulnerability in joomla/joomla-cms. A fix is available for joomla/joomla-cms — see the affected versions and patch details below.
Joomla CMS Multi-Factor Authentication Bypass
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-6423-85cc-8gf6.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-6423-85cc-8gf6 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
joomla/joomla-cms🐘joomla/joomla-cmsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Insufficient state checks lead to a vector that allows to bypass 2FA checks.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | joomla/joomla-cms | ≥ 5.0.0&&< 5.2.6 | 5.2.6composer require joomla/joomla-cms:^5.2.6 |
| 🐘Packagist | joomla/joomla-cms | ≥ 4.0.0&&< 4.4.13 | 4.4.13composer require joomla/joomla-cms:^4.4.13 |
Affected Products
joomla\!joomlaDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for joomla/joomla-cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update joomla/joomla-cms to 5.2.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6423-85cc-8gf6 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.
Frequently Asked Questions
Is GHSA-6423-85cc-8gf6 in your dependencies?
Find it across Packagist, including transitive dependencies.