OpenClaw before 2026.3.25 contains a pre-authentication rate-limit bypass vulnerability in webhook token validation that allows attackers to brute-force weak webhook secrets. The vulnerability exists because invalid webhook tokens are rejected without throttling repeated authentication attempts, enabling attackers to guess weak tokens through rapid successive requests.
{
"cwe_ids": [
"CWE-307"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35646.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"fixed": "2026.3.25"
}
],
"source": "AFFECTED_FIELD"
},
{
"extracted_events": [
{
"fixed": "2026.3.25"
}
],
"source": "CPE_FIELD"
},
{
"extracted_events": [
{
"fixed": "2026.3.25"
}
],
"source": "DESCRIPTION"
}
],
"cna_assigner": "VulnCheck"
}