CVE-2026-118712
A NVD · · CVE-2026-118712
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 alert contains only the NVD short description and no information beyond patch-level detail about active exploitation, a PoC, or affected versions.
Description
CVE-2026-118712 is an integer underflow vulnerability in Microsoft Office Excel that allegedly allows an unauthorized attacker to execute code over a network. The NVD description does not specify affected versions, exploitation conditions, or detailed attack vectors. There are no indications of active exploitation, a public PoC, or inclusion in CISA KEV. As a remote code execution issue in an Office product, the vulnerability is fundamentally severe, but the concrete patch and exploit status remains unclear.
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 an integer underflow vulnerability in Microsoft Office Excel by crafting a malicious file that, when opened by a user, leads to arbitrary code execution. | high | llm |