# CVE-2026-78323: Jss: jss: jsstrustmanager does not verify nss trust flags on ca certificates

Status: published. Published: 2026-08-24. Updated: 2026-11-06.

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.

## Remediation

- 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. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Certificate System 10 (redhat-pki:10/jss): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Certificate System 11 (jss): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (jss): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (jss): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (jss): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-core:10.6/jss): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (jss): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-05; percentile 7.18%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-295

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-78323 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2521775 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-78323; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-78323; retrieved 2026-11-06; source updated Not reported

Revision: 0dd1950e67297e0e8a14cfc62831848a7abbac0ae573814faca3158297e3196c

Canonical: https://y2.dev/cve/CVE-2026-78323

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