GitLab 18.11 < 18.11.1 (CVE-2026-3254)

low Nessus Plugin ID 309669

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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 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox. (CVE-2026-3254)

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 18.11.1 or later.

Plugin Details

Severity: Low

ID: 309669

File Name: gitlab_cve-2026-3254.nasl

Version: 1.2

Type: Combined

Agent: unix

Family: CGI abuses

Published: 4/22/2026

Updated: 4/24/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-3254

CVSS v3

Risk Factor: Low

Base Score: 3.5

Temporal Score: 3.1

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

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

Vulnerability Information

CPE: cpe:/a:gitlab:gitlab

Required KB Items: installed_sw/GitLab

Exploit Ease: No known exploits are available

Patch Publication Date: 4/22/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-3254

IAVA: 2026-A-0392

Detections

Analytics