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CVE-2026-87863VulnerabilityPublished Updated

Microsoft · HSTS response erases persisted entries

Affects MicrosoftSource GCVE Database

0
Authoritative record:CVE-2026-87863· Medium

Not known to be exploited.

Data as of 28 Oct 2026, 09:44 UTC

Severity
Medium

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
  • >=8.22.0 <=8.22.0
  • >=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
Fixed in–

Description

A vulnerability identified as CVE-2026-87863 affects Microsoft software version 3.0, where an HSTS response causes persisted entries to be erased. No detailed technical or impact information is provided beyond this behavior.

References

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