Microsoft · IMAP APPEND plus CRLF conversion command injection
Affects MicrosoftSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 09:29 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 20 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| curlcurl | Affected
| Fixed in– |
Description
CVE-2026-87864 is a command injection vulnerability related to the IMAP APPEND command combined with CRLF conversion in Microsoft software version 3.0. The vulnerability has been published but lacks detailed technical or impact information and no CVSS score is available.