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Description

OpenClaw before 2026.3.28 contains a missing rate limiting vulnerability in the Nextcloud Talk webhook authentication that allows attackers to brute-force weak shared secrets. Attackers who can reach the webhook endpoint can exploit this to forge inbound webhook events by repeatedly attempting authentication without throttling.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-31 | Updated 2026-03-31 | Assigner VulnCheck




MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-307 Improper Restriction of Excessive Authentication Attempts

Product status

Default status
unaffected

Any version before 2026.3.28
affected

2026.3.28 (semver)
unaffected

Credits

AntAISecurityLab reporter

References

github.com/...enclaw/security/advisories/GHSA-9528-x887-j2fp (GitHub Security Advisory (GHSA-9528-x887-j2fp)) third-party-advisory

github.com/...ommit/e403decb6e20091b5402780a7ccd2085f98aa3cd (Patch Commit) patch

www.vulncheck.com/...on-webhook-shared-secret-authentication (VulnCheck Advisory: OpenClaw < 2026.3.28 - Brute Force Attack via Missing Rate Limiting on Webhook Shared Secret Authentication) third-party-advisory

cve.org (CVE-2026-33580)

nvd.nist.gov (CVE-2026-33580)

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