BREW-OPENCLAW-CLI-CVE-20… (GHSA-R9Q5-C7QC-P26W)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:21 – Updated: 2026-09-25 08:57 – Source websiteSummary
When Nextcloud Talk webhook signing was valid, replayed requests could be accepted without durable replay suppression, allowing duplicate inbound processing after replay-window expiry or process restart.
Details
OpenClaw's Nextcloud Talk webhook path verified HMAC(secret, random + body) but previously lacked durable replay state tied to webhook events. This allowed replay of a previously valid signed request in some operational conditions.
The fix on main adds:
- persistent per-account replay dedupe for Nextcloud Talk webhook events,
- replay checks before webhook side effects (onMessage),
- backend-origin validation against configured account base URL (when configured).
Impact
A captured valid signed webhook request could be replayed to trigger duplicate inbound handling. This is an integrity/availability issue (duplicate actions/noise), scoped to deployments using Nextcloud Talk webhook integration.
Affected Packages / Versions
- Package:
openclaw(npm) - Affected:
<= 2026.2.24 - Patched in release:
2026.2.25
Fix Commit(s)
d512163d686ad6741783e7119ddb3437f493dbbc
Release Process Note
patched_versions is pre-set to the release (2026.2.25) so once npm release 2026.2.25 is published, advisory is now published.
OpenClaw thanks @aristorechina for reporting.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"upstream_fixed_in": "2026.2.25"
},
"package": {
"ecosystem": "Homebrew",
"name": "openclaw-cli",
"purl": "pkg:brew/openclaw-cli"
},
"ranges": [
{
"events": [
{
"introduced": "2026.1.29"
},
{
"fixed": "2026.2.25"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "npm",
"key": "pkg:npm/openclaw@2026.9.6",
"name": "openclaw",
"strategy": "registry",
"subject_version": "2026.9.6"
}
]
},
"details": "### Summary\nWhen Nextcloud Talk webhook signing was valid, replayed requests could be accepted without durable replay suppression, allowing duplicate inbound processing after replay-window expiry or process restart.\n\n### Details\nOpenClaw\u0027s Nextcloud Talk webhook path verified `HMAC(secret, random + body)` but previously lacked durable replay state tied to webhook events. This allowed replay of a previously valid signed request in some operational conditions.\n\nThe fix on `main` adds:\n- persistent per-account replay dedupe for Nextcloud Talk webhook events,\n- replay checks before webhook side effects (`onMessage`),\n- backend-origin validation against configured account base URL (when configured).\n\n### Impact\nA captured valid signed webhook request could be replayed to trigger duplicate inbound handling. This is an integrity/availability issue (duplicate actions/noise), scoped to deployments using Nextcloud Talk webhook integration.\n\n### Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Affected: `\u003c= 2026.2.24`\n- Patched in release: `2026.2.25`\n\n### Fix Commit(s)\n- `d512163d686ad6741783e7119ddb3437f493dbbc`\n\n### Release Process Note\n`patched_versions` is pre-set to the release (`2026.2.25`) so once npm release `2026.2.25` is published, advisory is now published.\n\nOpenClaw thanks @aristorechina for reporting.",
"id": "BREW-openclaw-cli-CVE-2026-28449",
"modified": "2026-09-25T08:57:17Z",
"published": "2026-08-13T17:21:32Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28449"
},
{
"type": "WEB",
"url": "https://github.com/openclaw/openclaw/commit/d512163d686ad6741783e7119ddb3437f493dbbc"
},
{
"type": "PACKAGE",
"url": "https://github.com/openclaw/openclaw"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "OpenClaw\u0027s Nextcloud Talk webhook replay could trigger duplicate inbound processing",
"upstream": [
"GHSA-r9q5-c7qc-p26w",
"CVE-2026-28449"
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.