Auth bypass in Red Hat Enterprise Linux 10
CVE-2026-76578
A flaw was found in FreeIPA. The self-managed OTP token ACI does not require authentication and does not restrict which attributes may be added alongside the token entry. An unauthenticated LDAP client can exploit this, combined with a related flaw in the underlying directory server's ACI evaluation (tracked separately), to create an arbitrary attacker-controlled Kerberos principal and have it added to the administrators group. This allows a remote, unauthenticated attacker to obtain genuine FreeIPA administrator-group membership and perform administrative operations against the directory and, on SID-enabled deployments, other IdM services.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (68.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.012 · change: +0.008
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/security/cve/CVE-2026-76578 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:70564 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:72279 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:82935 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:83083 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:83085 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:83084 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:83460 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:83461 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-76578?
- CVE-2026-76578 is a critical-severity vulnerability in Red Hat Enterprise Linux 10, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-09-07.
- How severe is CVE-2026-76578?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-76578 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.