Affects Microsoft enterprise comms (Skype for Business / Lync); privilege escalation across many organizations warrants broad attention.
CVE-2026-83746
Absolute path traversal in Skype for Business/Lync allows privilege escalation.
Is CVE-2026-83746 being exploited?
Not confirmed. CVE-2026-83746 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.
How severe is CVE-2026-83746?
CVE-2026-83746 is rated High with a CVSS score of 8.1. 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-2026-83746?
Yes. A fix has been recorded for CVE-2026-83746. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-83746 affect?
CVE-2026-83746 affects Microsoft Skype for Business, Microsoft Lync. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-83746?
Apply Microsoft update immediately; restrict access to affected hosts until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can exploit path traversal over the network to escalate privileges on affected hosts, potentially gaining admin-level access.
Patch when possible
- affected>= 9319.0 and < 6.0.9319.886
- affected>= 2046.0 and < 7.0.2046.583
- affected>= 2046.0 and < 7.0.2046.889
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.