What’s Vulnerable › Vulnerabilities

CVE-2026-32253: Sunshine: Authentication bypass via improper client certificate validation

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-22 · updated 2026-07-23
• Weakness: CWE-287

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.

Affected products

• LizardByte Sunshine: before 2026.516.143833 — fixed in 2026.516.143833

How to fix

Upgrade to a fixed version: LizardByte Sunshine 2026.516.143833. Check the vendor advisory for mitigations.

References

• https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833
• https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57
• https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57

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