CVE-2026-32253
CRITICALSunshine: Authentication bypass via improper client certificate validation
Title source: cnaDescription
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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57
X_Refsource_Misc x_refsource_misc
https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833
Scores
CVSS v3
9.8
EPSS
0.0032
EPSS Percentile
23.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-287
CWE-295
Status
published
Products (2)
lizardbyte/sunshine
< 2026.516.143833
LizardByte/Sunshine
< 2026.516.143833
Published
May 22, 2026
Tracked Since
May 22, 2026