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Fencer Vulns
medium 6.5

CVE-2026-78323 json

Jss: jss: jsstrustmanager does not verify nss trust flags on ca certificates

published 2026-08-24 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-64826

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-78323 updated cvss 6.5

jss: jss: JSSTrustManager does not verify NSS trust flags on CA certificates

  • Red Hat Certificate System 10 jss Red Hat Certificate System 11 jss
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 jss, jss-javadoc
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 jss, idm-jss Red Hat Enterprise Linux 10 jss
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 7 jss, jss-javadoc Red Hat Enterprise Linux 8 jss, idm-jss, jss-javadoc, idm-jss-javadoc
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

  • Red Hat Red Hat Certificate System 10
  • Red Hat Red Hat Certificate System 11
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.