CVE-2026-120003
A NVD · · CVE-2026-120003
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
Beyond the bare patch information, the alert contains no details on active exploitation, affected sectors, or attacker TTPs.
Description
Microsoft Office contains a heap-based buffer overflow vulnerability that, according to NVD, can allow an unauthorized attacker to execute arbitrary code over the network. The flaw affects content processing by Office applications and thus follows the classic pattern of a client-side vulnerability typically triggered by opening crafted documents. At the time of disclosure there is no information on exploitation in the wild, a proof-of-concept exploit, or inclusion in the CISA KEV list. Details on affected versions, severity (CVSS), and patch status are not specified in the short entry. No attribution to a threat actor is included.
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 to execute arbitrary code on a victim's system, likely by inducing the user to open a specially crafted document or interact with malicious content. | high | llm |