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CVE-2023-35311 is a security feature bypass vulnerability in Microsoft Outlook that allows an attacker to circumvent the Outlook Security Notice prompt when a victim interacts with a maliciously crafted link. The flaw reduces the effectiveness of Outlook’s built-in warning mechanism intended to alert users before opening potentially unsafe content. Microsoft indicated that the Preview Pane can be an attack vector, although successful exploitation still requires user interaction. The vulnerability was reported as exploited in the wild as a zero-day.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft vulnerability listed in the CERT-MU note as one of multiple zero-day vulnerabilities exploited in the wild.
Microsoft Outlook security feature bypass that can suppress/bypass the Outlook Security Notice prompt via user interaction with a malicious URL; exploited as a zero-day.
A Microsoft Outlook security feature bypass that lets attackers evade the Outlook Security Notice prompt (likely used in conjunction with other exploits).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.