CVE-2026-28449 MEDIUM

CVE-2026-28449: OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression

Vendor Openclaw
Product OpenClaw
Weakness CWE-294
Published March 19, 2026
Last update April 29, 2026
View on NVD All CVEs

CVSS base score

6.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

OpenClaw versions prior to 2026.2.25 lack durable replay state for Nextcloud Talk webhook events, allowing valid signed webhook requests to be replayed without suppression. Attackers can capture and replay previously valid signed webhook requests to trigger duplicate inbound message processing and cause integrity or availability issues.

Key dates

02Disclosure timeline

March 19, 2026 CVE published
April 29, 2026 Record updated