Medium
jss — security advisory
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.
- Products
- jss
- Affected versions
- 4.3.1-6, 4.4.2-1, 4.4.2-2, 4.4.2-3, 4.4.2-6, 4.4.3-1, 4.6.1-3, 4.6.2-1, 4.6.3-1, 4.8.0-2, 5.0.0-1, 5.4.2-1, 5.5.0-1, 5.5.0-1build1, 5.9.0~beta3-3ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-78323
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:19 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-78323
jss
Fixed versions: Not specified
jss
Fixed versions: Not specified
jss
Fixed versions: Not specified
jss
Fixed versions: Not specified
jss
Fixed versions: Not specified
jss
Fixed versions: Not specified
jss
Fixed versions: Not specified
Complete source record
{
"id": "b81d54e543b0dd3dfd2e4bd6ce1b83cf6952b132ea4d6bcf36c9e2a089966069",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-78323",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-78323",
"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.",
"evidence": "osv:UBUNTU-CVE-2026-78323",
"products": [
{
"name": {
"value": "jss",
"evidence": "/affected/0/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "4.3.1-6",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
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"affected_versions": [
{
"value": "4.4.2-1",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
},
{
"value": "4.4.2-3",
"evidence": "/affected/1/versions"
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{
"value": "4.4.2-6",
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{
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{
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"evidence": "/affected/2/versions"
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{
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}
]
},
{
"name": {
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},
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"affected_versions": [
{
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{
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{
"name": {
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"affected_versions": [
{
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{
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"evidence": "/affected/4/versions"
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{
"value": "5.5.0-1build1",
"evidence": "/affected/4/versions"
}
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},
{
"name": {
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"evidence": "/affected/5/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
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]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/6/versions"
},
{
"value": "5.9.0~beta3-3ubuntu1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-78323",
"aliases": [
"UBUNTU-CVE-2026-78323"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jss",
"purl": "pkg:deb/ubuntu/jss?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"4.3.1-6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78323.json"
},
"ecosystem_specific": {
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{
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},
{
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],
"package": {
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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"4.4.2-2",
"4.4.2-3",
"4.4.2-6",
"4.4.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78323.json"
},
"ecosystem_specific": {
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}
]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/jss?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"4.6.1-3",
"4.6.2-1",
"4.6.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78323.json"
},
"ecosystem_specific": {
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},
{
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],
"package": {
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"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"4.8.0-2",
"5.0.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78323.json"
},
"ecosystem_specific": {
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"package": {
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
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"5.5.0-1",
"5.5.0-1build1"
],
"database_specific": {
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},
"ecosystem_specific": {
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
"5.9.0~beta3-3ubuntu1"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
{
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],
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"5.5.0-1build1",
"5.9.0~beta3-3ubuntu1"
],
"database_specific": {
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},
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}
]
}
}
],
"modified": "2026-10-17T13:01:09.620148044Z",
"provider": "osv",
"upstream": [
"CVE-2026-78323"
],
"references": [
"https://ubuntu.com/security/CVE-2026-78323",
"https://www.cve.org/CVERecord?id=CVE-2026-78323",
"https://bugzilla.redhat.com/show_bug.cgi?id=2521775"
]
},
"related_cves": [
{
"value": "CVE-2026-78323",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361093,
"published_at": "2026-08-24T12:16:00+00:00"
}