CVE-2026-3254

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Source
https://cve.org/CVERecord?id=CVE-2026-3254
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3254.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-3254
Aliases
Published
2026-04-22T16:29:48Z
Modified
2026-08-27T11:30:33Z
Severity
  • 3.5 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Improper Restriction of Rendered UI Layers or Frames in GitLab
Details

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.

Database specific 
{
    "cna_assigner": "GitLab",
    "cwe_ids": [
        "CWE-1021"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3254.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "18.11"
                },
                {
                    "fixed": "18.11.1"
                }
            ],
            "source": "AFFECTED_FIELD"
        },
        {
            "extracted_events": [
                {
                    "introduced": "18.11"
                },
                {
                    "fixed": "18.11.1"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}
References

Affected packages

Git / gitlab.com/gitlab-org/gitlab

Affected ranges

Type
GIT
Repo
https://gitlab.com/gitlab-org/gitlab
Events
Introduced
1060c7b0ff78be7c8abe8fd6d23dcb1ca493fd78
Last Affected
1060c7b0ff78be7c8abe8fd6d23dcb1ca493fd78
Database specific
Show details 
{
    "cpe": [
        "cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:community:*:*:*",
        "cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:enterprise:*:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "18.11.0"
        },
        {
            "last_affected": "18.11.0"
        }
    ],
    "source": "CPE_STRING"
}

Affected versions

18.*
18.11.0
v18.*
v18.11.0-ee

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3254.json"