CVE-2026-78323 Jss: jss: jsstrustmanager does not verify nss trust flags on ca certificates
Attackers can bypass TLS trust validation in JSS by exploiting missing NSS trust flag checks, enabling man-in-the-middle attacks in specific configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78323?
CVE-2026-78323 is a medium-severity vulnerability in Red Hat Certificate System 10, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2026-78323?
How do I fix CVE-2026-78323?
Apply the vendor's patch.
Is CVE-2026-78323 being exploited?
There is no known exploitation of CVE-2026-78323 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-78323, GHSA-vc6r-2f9f-w5j6, OESA-2026-4134, OESA-2026-4135, OESA-2026-4136, OESA-2026-4137 and 1 more.