CVE-2026-32253
Sunshine: Authentication bypass via improper client certificate validation
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.
INFO
Published Date :
May 22, 2026, 5:16 p.m.
Last Modified :
May 26, 2026, 2:43 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Sunshine to version 2026.516.143833 or later.
- Ensure OpenSSL verification is correctly configured.
- Review certificate validation logic.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-32253.
| URL | Resource |
|---|---|
| https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833 | Product Release Notes |
| https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 | Exploit Vendor Advisory |
| https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-32253 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-32253
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-32253 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-32253 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 26, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:lizardbyte:sunshine:*:*:*:*:*:*:*:* versions up to (excluding) 2026.516.143833 Added Reference Type GitHub, Inc.: https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833 Types: Product, Release Notes Added Reference Type CISA-ADP: https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 -
New CVE Received by [email protected]
May. 22, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-287 Added CWE CWE-295 Added Reference https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833 Added Reference https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57