Remote OS command execution in Juniper Session Smart Router/Conductor impacts core network infrastructure; high CVSS and potential for widespread disruption to enterprise networks.
CVE-2026-103403
OS command injection in Juniper Session Smart devices allowing remote command execution and file deletion.
Is CVE-2026-103403 being exploited?
Not confirmed. CVE-2026-103403 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-103403?
CVE-2026-103403 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-103403?
Not known from our data. No patch reference has been recorded for CVE-2026-103403, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-103403 affect?
CVE-2026-103403 affects Juniper Session Smart Router, Juniper Session Smart Conductor, AccessManager component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-103403?
Apply Juniper advisory mitigations/patches immediately; restrict management-plane access; review audit logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote OS command execution and arbitrary file deletion via AccessManager audit-rule deletion, enabling device compromise and network disruption.
Immediate action required
- affected< 7.0.5
- affected>= 7.1.0 and < 7.1.7
- affected>= 7.2.0 and < 7.2.3
- affected< 7.0.5
- affected>= 7.1.0 and < 7.1.7
- affected>= 7.2.0 and < 7.2.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.