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CVE-2026-42897

Microsoft Exchange Server Spoofing Vulnerability

Published
Last modified
published
Listed in CISA KEV
Fix
Fixed in 15.01.2507.069, 15.02.1544.041, 15.02.1748.046, 15.02.2562.043
None on Exploit-DB, Metasploit or GitHub

Summary

Microsoft Exchange Server is affected by this vulnerability, which stems from improper handling of input in web page generation (cross-site scripting). An unauthorized attacker over a network could exploit it to perform spoofing, potentially tricking users by impersonating legitimate content or senders.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original 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.

Timeline

  1. CVE published
  2. Added to CISA KEV

    CISA has evidence of exploitation in the wild

  3. CISA remediation deadline

    Due date for US federal agencies to patch

  4. Record last updated
  5. EPSS reached 10%

    FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 23

    From 15.01.0.0 · fixed in 15.01.2507.069

  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 14

    From 15.02.0.0 · fixed in 15.02.1544.041

  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 15

    From 15.02.0.0 · fixed in 15.02.1748.046

  • Microsoft Microsoft Exchange Server Subscription Edition RTM

    From 15.02.0.0 · fixed in 15.02.2562.043

References 1

msrc.microsoft.com