CVE-2026-40459
LDAP injection in PAC4J allows low-priv remote attacker to run unauthorized LDAP queries.
Is CVE-2026-40459 being exploited?
Not confirmed. CVE-2026-40459 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 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-40459?
CVE-2026-40459 is rated High with a CVSS score of 8.7. 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-2026-40459?
Yes. A fix has been recorded for CVE-2026-40459. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40459 affect?
CVE-2026-40459 affects PAC4J library. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40459?
Upgrade to fixed versions: 4.5.10+, 5.7.10+, or 6.4.1+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated LDAP injection enables arbitrary LDAP queries and directory operations; risk of data access or modification.
Immediate action required
- affected>= 4.0 and < 4.5.10
- affected>= 5.0 and < 5.7.10
- affected>= 6.0 and < 6.4.1
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.