Is CVE-2026-32253 actively exploited?

No active exploitation of CVE-2026-32253 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-32253 be exploited remotely?

Yes. CVE-2026-32253 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-32253?

CVE-2026-32253 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-32253

CWE-287Published: May 22, 2026· Updated: May 26, 2026

9.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-32253 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.