Detections
Analytics

JetBrains TeamCity < 2026.1.1 Reflected XSS (CVE-2026-49371)

high Nessus Plugin ID 318690

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Synopsis

The remote host is affected by a cross-site scripting vulnerability.

Description

The version of JetBrains TeamCity installed on the remote host is prior to 2026.1.1. It is, therefore, affected by a vulnerability:

 - In JetBrains TeamCity before 2026.1.1 reflected XSS in the keyword filter was possible (CVE-2026-49371)

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 JetBrains TeamCity version 2026.1.1 or later.

See Also

https://www.jetbrains.com/privacy-security/issues-fixed/

Plugin Details

Severity: High

ID: 318690

File Name: teamcity_2026_1_1.nasl

Version: 1.3

Type: Combined

Agent: windows, macosx, unix

Family: Misc.

Published: 6/4/2026

Updated: 6/8/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus

Enable CGI Scanning: true

Risk Information

VPR

Risk Factor: Medium

Score: 5.1

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-49371

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: cpe:/a:jetbrains:teamcity

Required KB Items: installed_sw/JetBrains TeamCity

Exploit Ease: No known exploits are available

Patch Publication Date: 5/29/2026

Vulnerability Publication Date: 5/29/2026

Reference Information

CVE: CVE-2026-49371

CWE: 79

IAVA: 2026-A-0537