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CVE-2026-42897 is an improper input-neutralization vulnerability in the Outlook Web Access (OWA) component of on-premises Microsoft Exchange Server. Insufficient sanitization of HTML in email content permits attacker-controlled script constructs, including JavaScript event handlers, to be rendered in the DOM of an authenticated OWA session. A specially crafted HTML email can execute arbitrary JavaScript when the recipient opens or previews it in OWA. Exchange Online and Microsoft 365 are not reported as affected.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
363 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Exchange Server vulnerability weaponized by Hacking Cat to deliver Gorilla RAT into Russian enterprise environments.
Предположительная уязвимость Microsoft Exchange Server, использованная Hacking Cat в качестве вектора первоначального доступа для развертывания Gorilla RAT.
A high-severity stored cross-site scripting flaw in on-premises Exchange Server OWA that enables a 'Half-Click' compromise: a victim need only open a crafted email. The described exploitation delivers the OWAReaper browser-resident JavaScript implant, enabling mailbox reconnaissance, credential and OAuth-token theft, Exchange permission manipulation, persistence, and C2/exfiltration.
An unspecified Microsoft Exchange Server vulnerability that Microsoft fixed in June 2026 and that was reported as actively exploited.
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.