Researcher Drops New Microsoft Defender PoC Showing ShieldBreak Patch Can Be Bypassed
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
- 7.8
- EPSS
- 1%
Affected versions
Key insight
A patch for CVE-2026-69414 (ShieldBreak) has not fully remediated the issue; the researcher demonstrated with ShieldCrash that the vulnerability can still be triggered under specific conditions and arbitrary files can be read with SYSTEM privileges.
Description
CVE-2026-69414 (ShieldBreak) is a security vulnerability in Microsoft Defender with a CVSS score of 7.8 that Microsoft recently patched. Researcher Chaotic Eclipse has now published a proof-of-concept called ShieldCrash demonstrating that the patch was incomplete: under specific conditions the original vulnerability can still be exploited to read arbitrary files with SYSTEM privileges. All supported desktop versions of Windows are affected. Microsoft implemented several protective measures but missed a critical aspect of the vulnerability.
Risk score
- cvss base
- 78.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 15.00
- raw before weight
- 93.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
- consensus penalty
- -3.00
Path: operational
Consensus check
The pipeline self-checks before delivery. These rules lowered the score:
-
TTP_SKIPPEDTTP mapping skipped (placeholder or aggregation article) −3
- Consensus penalty:
- −3.0
- Total penalty:
- −3.0