CVE-2026-28449

MEDIUM 6.5

OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression

CVSS Score

6.5

EPSS Score

0.1%

EPSS Percentile

18th

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.

CWE	CWE-294
Vendor	openclaw
Product	openclaw
Published	Mar 19, 2026
Last Updated	Mar 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Affected Versions

OpenClaw / OpenClaw

0 < 2026.2.25

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w github.com: https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc vulncheck.com: https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression

Credits

🔍 Aristore (@aristorechina)