CVE-2026-78323
Received Received - Intake

JSS TrustManager Fails to Validate NSS Trust Flags in TLS

Publication date: 2026-08-24

Last updated on: 2026-08-24

Assigner: redhat-SADP

Description
A flaw was found in JSS (Java Security Services). The JSSTrustManager class does not verify NSS trust flags when validating CA certificates, allowing certificates present in the NSS database without TRUSTED_CA flags to be accepted as trust anchors for TLS connections. In non-default configurations where certificate revocation checking is disabled, this could allow a man-in-the-middle attacker to forge certificates accepted by PKI client connections.

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Meta Information

Published
2026-08-24
Last Modified
2026-08-24
Generated
2026-08-24
AI Q&A
2026-08-24
EPSS Evaluated
N/A
NVD
CVE-2026-78323
EUVD
EUVD-2026-64826

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
red_hat jss *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.

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Executive Summary

This vulnerability is in JSS (Java Security Services) where the JSSTrustManager class fails to verify NSS trust flags when validating CA certificates. It allows certificates without TRUSTED_CA flags to be accepted as trust anchors for TLS connections, potentially enabling man-in-the-middle attacks if certificate revocation checking is disabled.

Detection Guidance

Check if certificate revocation verification is disabled by inspecting JSS configurations for isCertRevocationVerify set to false. Review NSS database certificates for CA entries without TRUSTED_CA flags using certutil commands like certutil -L -d [NSS_DB_PATH].

Impact Analysis

An attacker could forge certificates and intercept or manipulate TLS connections if revocation checking is disabled. This could lead to unauthorized access to sensitive data or impersonation of trusted entities. Default configurations are protected, but non-default setups are at risk.

Compliance Impact

This vulnerability could lead to unauthorized data access or breaches, violating confidentiality requirements in GDPR and HIPAA. Non-compliance risks include legal penalties, reputational damage, and loss of trust due to potential data exposure through man-in-the-middle attacks.

Mitigation Strategies

Ensure certificate revocation verification remains enabled by not setting isCertRevocationVerify to false. For affected systems, update JSS to a patched version or apply Red Hat's provided fixes. Verify TomcatJSS uses JSSNativeTrustManager instead of JSSTrustManager.

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