Medium severity · published Mar 19, 2026
CVE-2026-28449
OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.2.25 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28449
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28449
Patch
https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc
Mitigation
https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w
Third Party Advisory
https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression
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