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

Quick assessment

Affected
LizardByte Sunshine
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sunshine是LizardByte开源的一个 Moonlight 的自助游戏流主机。 Sunshine 2026.516.143833之前版本存在信任管理问题漏洞，该漏洞源于OpenSSL验证结果处理不当，自定义验证回调将X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY、X509_V_ERR_CERT_NOT_YET_VALID和X509_V_ERR_CERT_HAS_EXPIRED视为成功，可能导致不受信任的证书通过认证并访问受保护的HTTPS端点。

CVSS 9.8 · Critical EPSS 0.29% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
LizardByte Sunshine < 2026.516.143833 affected
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I. Basic Information for CVE-2026-32253

Vulnerability Information
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Vulnerability Title
Sunshine: Authentication bypass via improper client certificate validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Sunshine 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sunshine是LizardByte开源的一个 Moonlight 的自助游戏流主机。 Sunshine 2026.516.143833之前版本存在信任管理问题漏洞，该漏洞源于OpenSSL验证结果处理不当，自定义验证回调将X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY、X509_V_ERR_CERT_NOT_YET_VALID和X509_V_ERR_CERT_HAS_EXPIRED视为成功，可能导致不受信任的证书通过认证并访问受保护的HTTPS端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LizardByte Sunshine < 2026.516.143833 -

II. Public POCs for CVE-2026-32253

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7591 chars
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-32253

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Vendor Advisories for CVE-2026-32253 (1)

Vendor Pages for CVE-2026-32253 (1)

IV. Related Vulnerabilities

Same product: Sunshine
Same vendor: LizardByte
Same weakness: CWE-287

V. Comments for CVE-2026-32253

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