Detections
Analytics

Jenkins LTS < 2.568.3 / Jenkins weekly < 2.580 Multiple Vulnerabilities

high Nessus Plugin ID 342360

Synopsis

An application running on a remote web server host is affected by multiple vulnerabilities

Description

According to its its self-reported version number, the version of Jenkins running on the remote web server is Jenkins LTS prior to 2.568.3 or Jenkins weekly prior to 2.580. It is, therefore, affected by multiple vulnerabilities:

 - In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, transient fields cannot be excluded from deserialization, allowing attackers able to submit configuration updates to specify the values of transient fields that will be deserialized, the impact depending on how those fields are used.
 (CVE-2026-84650)

 - In Stapler 1839.ved17667b_a_eb_5 through 2107.v8dfcb_e8ed317 (both inclusive), except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.447 through 2.579 (both inclusive), LTS 2.452.1 through 2.568.2 (both inclusive), an HTTP endpoint serving dynamically generated JavaScript resources embeds the user's cross-site request forgery (CSRF) token (crumb) as a string literal, allowing attackers with control over a page hosted on the same site as Jenkins to obtain a valid crumb for the targeted user's session and perform actions on their behalf. (CVE-2026-84649)

 - In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, user objects can appear as nested field values in other deserialized XML objects, allowing attackers with Overall/Read permission to create user objects by submitting crafted XML. (CVE-2026-84646)

 - In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in control of agent processes. (CVE-2026-84648)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade Jenkins weekly to version 2.580 or later, or Jenkins LTS to version 2.568.3 or later.

See Also

https://jenkins.io/security/advisory/2026-09-02

Plugin Details

Severity: High

ID: 342360

File Name: jenkins_2_580.nasl

Version: 1.1

Type: Combined

Agent: windows, macosx, unix

Family: CGI abuses

Published: 9/2/2026

Updated: 9/2/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Enable CGI Scanning: true

Risk Information

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-84649

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-84650

Vulnerability Information

CPE: cpe:/a:cloudbees:jenkins, cpe:/a:jenkins:jenkins

Required KB Items: installed_sw/Jenkins

Exploit Ease: No known exploits are available

Patch Publication Date: 9/2/2026

Vulnerability Publication Date: 9/2/2026

Reference Information

CVE: CVE-2026-84646, CVE-2026-84647, CVE-2026-84648, CVE-2026-84649, CVE-2026-84650, CVE-2026-84651, CVE-2026-84652, CVE-2026-84654, CVE-2026-84655, CVE-2026-84656, CVE-2026-84657