Widely deployed Zoom Workplace; unauthenticated network privilege escalation could disrupt organizations.
CVE-2026-30903
Unauthenticated privilege escalation in Zoom Workplace for Windows before 6.6.0 via Mail feature.
Is CVE-2026-30903 being exploited?
Not confirmed. CVE-2026-30903 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 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-30903?
CVE-2026-30903 is rated Critical with a CVSS score of 9.6. 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-2026-30903?
Yes. A fix has been recorded for CVE-2026-30903. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-30903 affect?
CVE-2026-30903 affects Zoom Workplace for Windows (<6.6.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-30903?
Update to Zoom 6.6.0 or newer.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can escalate privileges by manipulating Mail feature file name/path via network, potentially full system access.
Immediate action required
- affectedsee references
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.