PT-2026-7408 · Microsoft · Exchange Server

Vladislav Berghici · Published 2026-02-10 · Updated 2026-03-16 · CVE-2026-21527

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Microsoft Exchange Server (affected versions not specified)

Description A flaw in Microsoft Exchange Server’s user interface can lead to the misrepresentation of critical information. This allows an unauthorized attacker to conduct spoofing attacks over a network. The issue enables attackers to affect the system through spoofing.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Insufficient Verification of Data Authenticity

UI Misrepresentation of Critical Information

Weakness Enumeration

CWE-1286

CWE-345

CWE-451

Related Identifiers

BDU:2026-01812

CVE-2026-21527

ZDI-26-082

ZDI-26-194

Affected Products

Exchange Server

References · 7

• https://zerodayinitiative.com/advisories/ZDI-26-194 · Security Note
• https://bdu.fstec.ru/vul/2026-01812 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-21527 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-21527 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21527 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-26-082 · Security Note