GitLab 16.9.6 < 18.8.9 / 18.9 < 18.9.5 / 18.10 < 18.10.3 (CVE-2026-5173)

high Nessus Plugin ID 305636

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Synopsis

The version of GitLab installed on the remote host is affected by a vulnerability.

Description

The version of GitLab installed on the remote host is affected by a vulnerability, as follows:

- GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to invoke unintended server-side methods through websocket connections due to improper access control. (CVE-2026-5173)

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 GitLab version 18.8.9, 18.9.5, 18.10.3 or later.

Plugin Details

Severity: High

ID: 305636

File Name: gitlab_cve-2026-5173.nasl

Version: 1.3

Type: Combined

Agent: unix

Family: CGI abuses

Published: 4/8/2026

Updated: 4/13/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2026-5173

CVSS v3

Risk Factor: High

Base Score: 8.5

Temporal Score: 7.6

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

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

Vulnerability Information

CPE: cpe:/a:gitlab:gitlab

Required KB Items: installed_sw/GitLab

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/8/2026

Vulnerability Publication Date: 4/8/2026

Reference Information

CVE: CVE-2026-5173

IAVA: 2026-A-0311

Detections

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