CVE-2026-32253CWE-287CWE-295

Sunshine: Authentication bypass via improper client certificate validation

Critical · published May 22, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
36.2
In the wild
Unconfirmed
What it is

Sunshine is a self-hosted game stream host for Moonlight. In versions prior to 2026.516.143833, the client-certificate authentication can be bypassed because of how OpenSSL verification results are handled. In src/crypto.cpp, the custom verify callback treats X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY, X509_V_ERR_CERT_NOT_YET_VALID, and X509_V_ERR_CERT_HAS_EXPIRED as success. This can allow an untrusted certificate to pass authentication and access protected HTTPS endpoints. This issue has been fixed in version 2026.516.143833.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00430 · 36.2th percentile
Weaknesses
CWE-287 · Improper Authentication; CWE-295 · Improper Certificate Validation
Published
2026-05-22T17:07Z
EPSS history
Timeline
  • 22 MAY 17:07Z
    Sunshine: Authentication bypass via improper client certificate validation
    cvelistv5