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CVE

CVE-2026-32253

Sunshine: Authentication bypass via improper client certificate validation
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CVE

CVE-2026-32253

Sunshine: Authentication bypass via improper client certificate validation

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 X509VERRUNABLETOGETISSUERCERTLOCALLY, X509VERRCERTNOTYETVALID, and X509VERRCERTHAS_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.

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32253.json, https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57, https://nvd.nist.gov/vuln/detail/CVE-2026-32253

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00291%
EPSS Percentile
0.21761%
Introduced Version
0
Fix Available
14ffa6fdaa53f7b51512be2b3d24f3939695403c

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