CVE-2026-28449 json
OpenClaw < 2026.2.25 - Webhook Replay Attack via Missing Durable Replay Suppression
published 2026-03-03 8 mo ago modified 2026-06-23 4 mo ago also GHSA-r9q5-c7qc-p26w , EUVD-2026-13011
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.3 | 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 |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| CNA | 4.0 | 6.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | openclaw | <2026.2.25 |
2026.2.25 |
Affected products
- OpenClaw OpenClaw
Classification
- Weakness
-
- CWE-294 Authentication Bypass by Capture-replay
References
-
github.com
/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc
patch, web
-
github.com
/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w
vendor-advisory, web, mitigation
-
vulncheck.com
/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-28449
advisory
-
github.com
/openclaw/openclaw
package
Sources
- CVE List CVE-2026-28449
- GitHub Advisory GHSA-r9q5-c7qc-p26w
- NVD CVE-2026-28449
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