Detections
Analytics

Atlassian Confluence 8.9.0 < 9.2.20 / 9.3.1 < 10.2.11 (CONFSERVER-103708)

high Nessus Plugin ID 316798

Synopsis

The remote Atlassian Confluence host is missing a security update.

Description

The version of Atlassian Confluence Server running on the remote host is affected by a vulnerability as referenced in the CONFSERVER-103708 advisory.

 - This Improper Encoding or Escaping of Output vulnerability allows an unauthenticated attacker to potentially disclose sensitive information via the Apache Tomcat JsonAccessLogValve, which has high impact to confidentiality, no impact to integrity, no impact to availability, and requires no user interaction. (CVE-2026-34483)

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

Solution

Upgrade to Atlassian Confluence version 9.2.20, 10.2.11 or later.

See Also

https://jira.atlassian.com/browse/CONFSERVER-103708

Plugin Details

Severity: High

ID: 316798

File Name: confluence_confserver-103708.nasl

Version: 1.1

Type: Combined

Agent: windows, macosx, unix

Family: CGI abuses

Published: 5/26/2026

Updated: 5/26/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Enable CGI Scanning: true

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-34483

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:atlassian:confluence

Required KB Items: installed_sw/Atlassian Confluence

Patch Publication Date: 5/5/2026

Vulnerability Publication Date: 4/4/2026

Reference Information

CVE: CVE-2026-34483

IAVA: 2026-A-0497