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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Fixes

Solution

No solution given by the vendor.


Workaround

In default configurations, this flaw is mitigated by the native revocation verification check (certChainRevokeVerify) which is enabled by default on PKI client connections. Ensure that certificate revocation verification remains enabled (do not set isCertRevocationVerify to false). On the server side, the default TomcatJSS configuration uses JSSNativeTrustManager which is not affected by this flaw.

History

Mon, 24 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 24 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 24 Aug 2026 11:30:00 +0000

Type Values Removed Values Added
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.
Title Jss: jss: jsstrustmanager does not verify nss trust flags on ca certificates
First Time appeared Redhat
Redhat certificate System
Redhat enterprise Linux
Weaknesses CWE-295
CPEs cpe:/a:redhat:certificate_system:10
cpe:/a:redhat:certificate_system:11
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat certificate System
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-24T11:50:28.901Z

Reserved: 2026-08-24T09:04:49.283Z

Link: CVE-2026-78323

cve-icon Vulnrichment

Updated: 2026-08-24T11:50:24.464Z

cve-icon NVD

Status : Received

Published: 2026-08-24T12:16:56.250

Modified: 2026-08-24T12:16:56.250

Link: CVE-2026-78323

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-24T09:07:55Z

Links: CVE-2026-78323 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-24T12:30:16Z

Weaknesses