CVE-2026-24423
Unauthenticated RCE via SmarterMail ConnectToHub API (pre-9511).
Is CVE-2026-24423 being exploited?
Yes. CVE-2026-24423 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-24423?
CVE-2026-24423 is rated Critical with a CVSS score of 9.3. 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-2026-24423?
Yes. A fix has been recorded for CVE-2026-24423. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-24423 affect?
CVE-2026-24423 affects SmarterMail pre-9511 (ConnectToHub API). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-24423?
Patch to build 9511 or newer
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via unauthenticated API; attacker can execute OS commands on server.
Patch when possible
- affected< 100.0.9511
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.