Juniper Junos OS up to 25.2R2-S1/25.4R1-S2/26.2R1-S1 J-Web improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.6$0-$5k0.85-

Summaryinfo

A vulnerability identified as very critical has been detected in Juniper Junos OS up to 25.2R2-S1/25.4R1-S2/26.2R1-S1. This vulnerability affects unknown code of the component J-Web. Performing a manipulation results in improper authentication. This vulnerability was named CVE-2026-101956. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Juniper Junos OS up to 25.2R2-S1/25.4R1-S2/26.2R1-S1. This affects some unknown functionality of the component J-Web. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at supportportal.juniper.net. This vulnerability is uniquely identified as CVE-2026-101956 since 09/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/15/2026).

Upgrading to version 25.2R2-S2, 25.4R1-S3 or 26.2R1-S2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-101440). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.6

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (juniper): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Junos OS 25.2R2-S2/25.4R1-S3/26.2R1-S2

Timelineinfo

09/28/2026 CVE reserved
10/14/2026 +16 days Advisory disclosed
10/14/2026 +0 days VulDB entry created
10/15/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: juniper.net

Advisory: supportportal.juniper.net
Status: Confirmed

CVE: CVE-2026-101956 (🔒)
GCVE (CVE): GCVE-0-2026-101956
GCVE (VulDB): GCVE-100-420093
EUVD: 🔒

Entryinfo

Created: 10/14/2026 18:59
Updated: 10/15/2026 07:53
Changes: 10/14/2026 18:59 (76), 10/15/2026 07:53 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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