CVE-2026-32253

Sunshine: Authentication bypass via improper client certificate validation

State: Published
Severity: 9.8 Critical
Published: May 22, 2026
Updated: May 26, 2026
Reserved: Mar 11, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-287 Improper Authentication
CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
SunshineLizardByte	< 2026.516.143833Affected

References

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