CVE-2026-73644
Authenticated LDAP SASL PLAIN allows proxy identity impersonation in OpenDJ <5.1.2
Is CVE-2026-73644 being exploited?
Not confirmed. CVE-2026-73644 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-73644?
CVE-2026-73644 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-2026-73644?
Yes. A fix has been recorded for CVE-2026-73644. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73644 affect?
CVE-2026-73644 affects OpenDJ (< 5.1.2), opendj-server-legacy (PlainSASLMechanismHandler). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73644?
Upgrade to OpenDJ 5.1.2; restrict PROXIED_AUTH and audit SASL usage if patch delayed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated user with PROXIED_AUTH can impersonate any resolvable non-root account, bypassing proxy ACI, enabling unauthorized access and actions.
Immediate action required
- affected< 5.1.2
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.