Juniper Networks Junos OS Improper Authentication Flaw (CVE-2026-101956) Rated CVSS 9.8
A newly published critical vulnerability in Juniper Networks Junos OS carries a CVSS score of 9.8. Here is what is affected and how to respond.
Key points
- CVE-2026-101956 affects Juniper Networks Junos OS.
- CVSS 9.8 (Critical).
- No exploitation confirmed yet.
Juniper Networks Junos OS is affected by CVE-2026-101956, a improper authentication that the National Vulnerability Database rates 9.8 out of 10.
At a glance
- CVE
- CVE-2026-101956
- Product
- Juniper Networks Junos OS
- CVSS
- 9.8 Critical
- Weakness
- improper authentication
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: An Improper Authentication vulnerability in the J-Web web management component of Juniper Networks Junos OS allows an unauthenticated remote attacker to execute arbitrary Junos commands with root privileges via the exposed J-Web web interface.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | before 25.2R2-S2, before 25.4R1-S3, before 26.2R1-S2 |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-101956
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-101956?
CVE-2026-101956 is a improper authentication vulnerability in Juniper Networks Junos OS.
How severe is CVE-2026-101956?
It has a CVSS score of 9.8 Critical.
Is CVE-2026-101956 being exploited?
There is no public confirmation of exploitation at the time of publication.
