CVE-2026-123384
A NVD · · CVE-2026-123384
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 8.8
- EPSS
- 0%
Key insight
The report only provides the NVD description of the vulnerability; there is no indication of active exploitation, PoC, or concrete attack vectors beyond the standard advisory.
Description
CVE-2026-123384 is a heap-based buffer overflow in Microsoft Office Outlook. An unauthenticated attacker can execute code over the network when a crafted message or corresponding Outlook object is processed. Outlook installations running vulnerable versions are affected; details on affected builds and fixes are available in the NVD entry. At the time of the report, there is no information on active exploitation, public PoCs, or inclusion in CISA KEV.
Risk score
- cvss base
- 88.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 88.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational