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CVE-2026-87864VulnerabilityPublished Updated

Microsoft · IMAP APPEND plus CRLF conversion command injection

Affects MicrosoftSource GCVE Database

0
Authoritative record:CVE-2026-87864· High

Not known to be exploited.

Data as of 28 Oct 2026, 09:29 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
curlcurlAffected
  • >=8.21.0 <=8.21.0
  • >=8.20.0 <=8.20.0
  • >=8.19.0 <=8.19.0
  • >=8.18.0 <=8.18.0
  • >=8.17.0 <=8.17.0
  • >=8.16.0 <=8.16.0
  • >=8.15.0 <=8.15.0
  • >=8.14.1 <=8.14.1
  • >=8.14.0 <=8.14.0
  • >=8.13.0 <=8.13.0
  • >=8.12.1 <=8.12.1
  • >=8.12.0 <=8.12.0
  • >=8.11.1 <=8.11.1
  • >=8.11.0 <=8.11.0
  • >=8.10.1 <=8.10.1
  • >=8.10.0 <=8.10.0
  • >=8.9.1 <=8.9.1
  • >=8.9.0 <=8.9.0
  • >=8.8.0 <=8.8.0
  • >=8.7.1 <=8.7.1
  • >=8.7.0 <=8.7.0
  • >=8.6.0 <=8.6.0
  • >=8.5.0 <=8.5.0
  • >=8.4.0 <=8.4.0
  • >=8.3.0 <=8.3.0
  • >=8.2.1 <=8.2.1
  • >=8.2.0 <=8.2.0
  • >=8.1.2 <=8.1.2
  • >=8.1.1 <=8.1.1
  • >=8.1.0 <=8.1.0
  • >=8.0.1 <=8.0.1
  • >=8.0.0 <=8.0.0
  • >=7.88.1 <=7.88.1
  • >=7.88.0 <=7.88.0
  • >=7.87.0 <=7.87.0
  • >=7.86.0 <=7.86.0
  • >=7.85.0 <=7.85.0
  • >=7.84.0 <=7.84.0
  • >=7.83.1 <=7.83.1
  • >=7.83.0 <=7.83.0
  • >=7.82.0 <=7.82.0
  • >=7.81.0 <=7.81.0
  • >=7.80.0 <=7.80.0
  • >=7.79.1 <=7.79.1
  • >=7.79.0 <=7.79.0
  • >=7.78.0 <=7.78.0
  • >=7.77.0 <=7.77.0
  • >=7.76.1 <=7.76.1
  • >=7.76.0 <=7.76.0
  • >=7.75.0 <=7.75.0
  • >=7.74.0 <=7.74.0
  • >=7.73.0 <=7.73.0
  • >=7.72.0 <=7.72.0
  • >=7.71.1 <=7.71.1
  • >=7.71.0 <=7.71.0
  • >=7.70.0 <=7.70.0
  • >=7.69.1 <=7.69.1
  • >=7.69.0 <=7.69.0
  • >=7.68.0 <=7.68.0
  • >=7.67.0 <=7.67.0
  • >=7.66.0 <=7.66.0
  • >=7.65.3 <=7.65.3
  • >=7.65.2 <=7.65.2
  • >=7.65.1 <=7.65.1
  • >=7.65.0 <=7.65.0
  • >=7.64.1 <=7.64.1
  • >=7.64.0 <=7.64.0
  • >=7.63.0 <=7.63.0
  • >=7.62.0 <=7.62.0
  • >=7.61.1 <=7.61.1
  • >=7.61.0 <=7.61.0
  • >=7.60.0 <=7.60.0
  • >=7.59.0 <=7.59.0
  • >=7.58.0 <=7.58.0
  • >=7.57.0 <=7.57.0
  • >=7.56.1 <=7.56.1
  • >=7.56.0 <=7.56.0
  • >=7.55.1 <=7.55.1
  • >=7.55.0 <=7.55.0
  • >=7.54.1 <=7.54.1
  • >=7.54.0 <=7.54.0
  • >=7.53.1 <=7.53.1
  • >=7.53.0 <=7.53.0
  • >=7.52.1 <=7.52.1
  • >=7.52.0 <=7.52.0
  • >=7.51.0 <=7.51.0
  • >=7.50.3 <=7.50.3
  • >=7.50.2 <=7.50.2
  • >=7.50.1 <=7.50.1
  • >=7.50.0 <=7.50.0
  • >=7.49.1 <=7.49.1
  • >=7.49.0 <=7.49.0
  • >=7.48.0 <=7.48.0
  • >=7.47.1 <=7.47.1
  • >=7.47.0 <=7.47.0
  • >=7.46.0 <=7.46.0
  • >=7.45.0 <=7.45.0
  • >=7.44.0 <=7.44.0
  • >=7.43.0 <=7.43.0
  • >=7.42.1 <=7.42.1
  • >=7.42.0 <=7.42.0
  • >=7.41.0 <=7.41.0
  • >=7.40.0 <=7.40.0
  • >=7.39.0 <=7.39.0
  • >=7.38.0 <=7.38.0
  • >=7.37.1 <=7.37.1
  • >=7.37.0 <=7.37.0
  • >=7.36.0 <=7.36.0
  • >=7.35.0 <=7.35.0
  • >=7.34.0 <=7.34.0
  • >=7.33.0 <=7.33.0
  • >=7.32.0 <=7.32.0
  • >=7.31.0 <=7.31.0
  • >=7.30.0 <=7.30.0
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.

References

Community reviews

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