CVE-2023-35311
Published: July 11, 2023
Official Description
Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.
CISA KEV Advisory
Microsoft Outlook Security Feature Bypass Vulnerability
Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Risk Analysis
Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the security notice prompt. This high-severity flaw is confirmed to be exploited in the wild (KEV), indicating a critical risk despite a low EPSS score.
This vulnerability is actively being exploited in the wild, as confirmed by its presence in CISA's KEV catalog.
Microsoft Outlook users should apply the latest security updates to address this security feature bypass vulnerability. Users should also remain vigilant about suspicious emails and attachments.
Technical Analysis
CVE-2023-35311 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2023-35311 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-35311 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1