CVE-2026-91143 goproxy - Broken Access Control

goproxy through 15.3 contains a broken access control vulnerability caused by failure to apply HTTP proxy basic authentication to CONNECT tunnel requests, letting unauthenticated clients relay arbitrary TCP traffic and access restricted destinations, exploit requires no special privileges.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.47% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-288

Vendor fix

Update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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