Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).
{
    "github_reviewed_at": "2021-04-07T19:31:51Z",
    "severity": "HIGH",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-918"
    ],
    "nvd_published_at": "2020-12-30T19:15:00Z"
}