CVE-2026-118714
A NVD · · CVE-2026-118714
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
Microsoft Excel is part of the company's Microsoft 365 stack, and a network-exploitable RCE vulnerability directly affects that software.
Description
The vulnerability CVE-2026-118714 is a heap-based buffer overflow in Microsoft Office Excel. An unauthenticated attacker can thereby execute code over the network. The NVD entry contains no information about active exploitation, KEV inclusion, or a public proof-of-concept. The Excel component of Microsoft Office is affected; further details on versions or attack vectors are not provided in the alert.
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
MITRE ATT&CK mapping
1 TTPProcedure details
| Technique | Tactic | Procedure | Conf. | Source |
|---|---|---|---|---|
| T1203 Exploitation for Client Execution | Execution | An attacker exploits a heap-based buffer overflow vulnerability in Microsoft Office Excel to execute arbitrary code when a victim opens a maliciously crafted Excel file, potentially delivered over a network. | high | llm |