CVE-2026-118718
A NVD · · CVE-2026-118718
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 contains no indication of active exploitation or attack campaigns and does not go beyond pure patch information.
Description
CVE-2026-118718 describes a heap-based buffer overflow in Microsoft Office Excel that is said to allow an unauthorized attacker to execute code over the network. The report does not provide further details on attack vectors, exploitability, or affected versions. There is no indication of active exploitation, proof-of-concept code, or inclusion in CISA KEV. It is a pure CVE description without strategic or campaign-related additional information.
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 | A heap-based buffer overflow in Microsoft Office Excel is exploited when a victim opens a maliciously crafted Excel file, allowing an attacker to execute arbitrary code. | high | llm |