Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, RequestTokenListener validates REQUEST_TOKEN only for POST requests, while the declarative GET guard runs only when an act parameter is present. Backend actions dispatched through the key parameter can therefore execute without a CSRF token when an authenticated backend user loads an attacker-controlled URL. Reachable actions remain limited to modules available to that user, and the advisory demonstrates destructive or state-changing actions rather than privilege escalation. This issue is fixed in versions 5.3.50 and 5.7.12.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-352"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107848.json"
}{
"extracted_events": [
{
"range": [
{
"introduced": "4.0.0"
},
{
"fixed": "5.3.50"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "5.4.0-RC1"
},
{
"fixed": "5.7.12"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "34dd27ee6739f10568d3d95d8784862255c925b4"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "5.7.12",
"range": [
{
"fixed": "a6543f49a92187a7368f51b290179c4795386e23"
}
],
"source": "REFERENCES_TAG"
}
]
}