CVE-2026-87861

critical · 9.1

When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.

9.1

CVSS

0.3%

EPSS (exploit prob.)

19th

EPSS percentile

2026-10-20

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-201

References

https://curl.se/docs/CVE-2026-87861.html
https://curl.se/docs/CVE-2026-87861.json
https://hackerone.com/reports/3972094
https://hackerone.com/reports/3972094

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-87861