CVE-2026-42897

The company warned about zero-day attacks exploiting the Exchange Server vulnerability CVE-2026-42897 on May 14.

June’s Patch Tuesday security updates have arrived, with SAP fixing four critical vulnerabilities and Microsoft addressing over 200 CVEs. Microsoft’s to-do list includes fixes for three zero days, 32 patches rated as ‘critical’, and a batch of other high-risk vulnerabilities that need urgent assessment. There’s also one older flaw under exploit, and some patches affecting […]

Microsoft marked its largest-ever Patch Tuesday this month, by shipping fixes for nearly 200 vulnerabilities. Within hours, “Nightmare Eclipse”, the researcher behind weeks of escalating Windows exploit releases, dropped a proof-of-concept exploit for a new zero-day: “RoguePlanet”, which abuses a race condition in Windows Defender to spawn a command shell running with SYSTEM-level privileges. Various researchers have confirmed that the PoC exploit works to achieve local privilege escalation. “In initial development, it was confirmed that … More →

June 2026 Patch Tuesday is now live: Record Microsoft Patch Tuesday, fresh zero-day My forecast from last month was only partly right. After the Anthropic Mythos announcements and the deluge of newly discovered vulnerabilities from vendors like Mozilla, Microsoft’s updates were standard fare, 65 CVEs reported in Windows 11 and 58 in Windows 10. The Microsoft Office releases were a bit higher with 19 CVEs or so reported for the online versions. Apple did indeed … More →

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Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Review: Foundations of Cybersecurity, 2nd edition Jason Andress has refreshed his introductory security text for No Starch Press. He writes in the introduction that the term security now extends past data center servers to cloud resources, mobile devices, the Internet of Things, and AI. Foundations of Cybersecurity: A Straightforward Introduction book is aimed at newcomers to the field, network and … More →

Linked URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897 | Posted by doener | 2 points | 0 comments

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds a flaw in Microsoft Exchange Server to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a flaw in Microsoft Exchange Server, tracked as CVE-2026-42897 (CVSS score of 8.1), to its Known Exploited Vulnerabilities (KEV) catalog. This week, Microsoft warned that threat actors are […]

A newly discovered zero-day vulnerability in Microsoft Exchange Server has experts declaring an emergency and urging CSOs to think about the need to abandon on-premises email solutions. “Because it’s already being exploited in the wild, this isn’t a ‘patch next week situation; it’s a ‘mitigate right now’ emergency,” warned Rob Enderle of the Enderle Group. […]

Microsoft warned that attackers are exploiting a new Exchange Server zero-day vulnerability, tracked as CVE-2026-42897, in the wild. Microsoft warned that threat actors are actively exploiting a new Exchange Server zero-day vulnerability tracked as CVE-2026-42897 (CVSS score 8.1). The vulnerability is an improper neutralization of input during web page generation (‘cross-site scripting’) in Microsoft Exchange […]

Microsoft has shared mitigations for CVE-2026-42897 until a permanent patch can be released for affected Exchange Server versions.

A critical cross-site scripting (XSS) vulnerability (CVE-2026-42897) in Microsoft Exchange Server is being exploited by attackers, Microsoft warned on Thursday. A permanent fix is still in the works. In the meantime, Microsoft provided temporary mitigations. About CVE-2026-42897 CVE-2026-42897 affects on-premises versions of Microsoft Exchange Server: Subscription Edition RTM, 2019, and 2016. Exchange Online is not affected. Flagged by an anonymous researcher, the vulnerability allows an unauthorized attacker to perform spoofing over a network. “An attacker … More →

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Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.