CVE-2026-32253
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
In Sunshine, a self-hosted game stream host for Moonlight, versions prior to 2026.516.143833, client-certificate authentication can be bypassed due to how OpenSSL verification results are handled. The custom verify callback treats some errors as success, allowing untrusted certificates.
Risk Assessment
An unauthenticated attacker can access protected HTTPS endpoints, potentially leading to system compromise.
Recommendation
Upgrade Sunshine to version 2026.516.143833 or later.
Other vulnerabilities in Sunshine
See all- CVE-2026-111044High
Sunshine from 2026.329.165800 until 2026.906.222525 accepted any client certificate that chained to a stored paired-client certificate, without requiring the presented certificate to be the exact enabled paired identity. Certificate text was compared without canonicalizing equivalent PEM encodings, allowing a previously paired client to bypass the Disable control.
- CVE-2025-54081Medium
The Windows service SunshineService is installed with an unquoted executable path. If Sunshine is installed in a directory whose name includes a space, the Service Control Manager (SCM) interprets the path incrementally and may execute a malicious binary placed earlier in the search string. This issue has been patched in version 2025.923.33222.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS