Detections
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CVE-2026-42897

medium

Description

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.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

https://thehackernews.com/2026/09/three-threat-groups-target-russian.html

https://www.helpnetsecurity.com/2026/09/02/microsoft-exchange-cve-2026-62911-critical-authentication-bypass-flaw/

https://www.bleepingcomputer.com/news/security/nearly-22-000-microsoft-exchange-servers-vulnerable-to-hijack-attacks/

https://www.theregister.com/security/2026/07/30/russian-spies-take-their-half-click-email-attack-from-zimbra-to-outlook/5281033

https://www.helpnetsecurity.com/2026/07/30/cve-2026-42897-microsoft-exchange-email-attack/

https://thehackernews.com/2026/07/russian-hackers-exploit-microsoft-owa.html

https://arstechnica.com/security/2026/07/kremlin-hackers-are-exploiting-exchange-flaw-to-backdoor-unpatched-networks/

https://www.proofpoint.com/us/blog/threat-insight/cleaning-out-inboxes-ta488-comes-outlook-another-half-click-exploit

https://www.infosecurity-magazine.com/news/ta488-outlook-half-click-owareaper/

https://www.bleepingcomputer.com/news/security/russian-hackers-exploit-exchange-owa-zero-day-for-long-term-mailbox-access/

https://therecord.media/russia-hackers-outlook-webmail-malware

https://www.securityweek.com/microsoft-patches-exploited-exchange-server-vulnerability/

https://www.helpnetsecurity.com/2026/06/10/microsoft-patch-tuesday-rogueplanet/

https://www.bleepingcomputer.com/news/microsoft/microsoft-patches-exchange-server-zero-day-exploited-in-attacks/

https://www.proofpoint.com/us/blog/threat-insight/more-cves-same-playbook-2026-vulnerability-exploitation-wild

https://thehackernews.com/2026/05/microsoft-warns-of-two-actively.html

https://www.darkreading.com/vulnerabilities-threats/microsoft-exchange-zero-day-no-patch

https://securityaffairs.com/192240/hacking/u-s-cisa-adds-a-flaw-in-microsoft-exchange-server-to-its-known-exploited-vulnerabilities-catalog.html

https://www.securityweek.com/microsoft-warns-of-exchange-server-zero-day-exploited-in-the-wild/

https://www.bleepingcomputer.com/news/microsoft/microsoft-warns-of-exchange-zero-day-flaw-exploited-in-attacks/

https://thehackernews.com/2026/05/on-prem-microsoft-exchange-server-cve.html

https://securityaffairs.com/192204/security/cve-2026-42897-microsoft-confirms-active-exploitation-of-exchange-server-zero-day.html

https://www.infosecurity-magazine.com/news/microsoft-zeroday-exchange-servers/

https://github.com/Byungju/cve-research-lab

https://github.com/imtoatb/Analyse-des-Avis-et-Alertes-ANSSI-avec-Enrichissement-des-CVE

https://github.com/Turner-Levey/kev-deadline-planner

https://github.com/gtamir02-png/cve-ai-agent

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897

Details

Source: Mitre, NVD

Published: 2026-05-14

Updated: 2026-06-15

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Severity: Medium

EPSS

EPSS: 0.71766

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest