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TI-2026-74194 Aliases CVE-2026-101956

Improper authentication in Junos OS J-Web allows root command execution

Priority MEDIUM 49CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

Juniper Networks Junos OS from 25.2 before 25.2R2-S2, from 25.4 before 25.4R1-S3 and from 26.2 before 26.2R1-S2 is affected. An improper authentication flaw (CWE-287) in the J-Web web management component lets an unauthenticated remote attacker run arbitrary Junos commands with root privileges through the exposed J-Web interface. The flaw is not listed in CISA KEV and no public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0075 55th percentileScored 2026-11-07
Fix Fixed Junos OS (Juniper Networks): 25.2R2-S2, 25.4R1-S3, 26.2R1-S2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JuniperJunos OS25.2 to before 25.2R2-S2; 25.4 to before 25.4R1-S3; 26.2 to before 26.2R1-S225.2R2-S2, 25.4R1-S3, 26.2R1-S2Patch availableCNA
  • Junos OS VendorJuniper Affected 25.2 to before 25.2R2-S2; 25.4 to before 25.4R1-S3; 26.2 to before 26.2R1-S2 Fixed in 25.2R2-S2, 25.4R1-S3, 26.2R1-S2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*——Juniper
  • cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* Versions — — ·Juniper

Remediation

Upgrade Junos OS to 25.2R2-S2, 25.4R1-S3 or 26.2R1-S2 or later. The sources do not list a vendor advisory for this fix.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Junos OS (Juniper Networks) Fixed in 25.2R2-S2, 25.4R1-S3, 26.2R1-S2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Juniper Networks Junos OS — supportportal.juniper.net/JSA112188

    11 records Highest priority Priority MEDIUM 8 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-74283 Reachable assertion in Junos OS TWAMP client disrupts rmopd servicePriority MEDIUM 46
    • TI-2026-74208 Integer underflow in Juniper Junos OS lets attackers crash the kernelPriority MEDIUM 46
    • TI-2026-74270 Buffer overflow in Junos OS DHCP process causes denial of servicePriority MEDIUM 44
    Show all 11 records → Advisory →

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-101956

References

Advisory 1

  • TI-2023-18638 Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-01585 Out of Cycle Security Advisory: Junos OS: Security vulnerability in J-Web and web based (HTTP/HTTPS) services KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-06436 Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-20885 Apache Commons Text prior to 1.10.0 allows RCE when applied to untrusted input due to insecure interpolation defaults CVSS 3.1CRITICAL 9.8
  • TI-2015-04610 Assertion failure in ISC BIND named via TKEY queries KEVCVSS 3.1HIGH 7.5
  • TI-2025-15550 Junos OS: An local attacker with shell access can execute arbitrary code KEVCVSS 4.0MEDIUM 6.7
See all 1284 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences