CVE-2026-33580

OpenClaw < 2026.3.28 - Brute Force Attack via Missing Rate Limiting on Webhook Shared Secret Authentication

CVSS 4.0 6.3 MEDIUMCVSS 3.1 6.5 MEDIUMEUVD CVSS 4.0 6.3 CVSS 4.0 · [email protected] · Secondary 6.3 MEDIUMCVSS 3.1 · [email protected] · Secondary 6.5 MEDIUMCVSS 3.1 · [email protected] · Primary 6.5 MEDIUMPublisher rating MODERATEFixed by openclaw 2026.3.28KEV status unknown

Original advisory

cve-program · CVE-2026-33580

Published

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.

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euvd · EUVD-2026-17439

Published

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nvd · CVE-2026-33580

Published

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osv · GHSA-9528-x887-j2fp

Published

## Summary Nextcloud Talk webhook signature failures were not throttled even though the integration relies on an operator-configured shared secret that may be weak. ## Impact An attacker who could reach the webhook endpoint could brute-force weak secrets online and then forge inbound webhook events. ## Affected Component `extensions/nextcloud-talk/src/monitor.ts` ## Fixed Versions - Affected: `<= 2026.3.24` - Patched: `>= 2026.3.28` - Latest stable `2026.3.28` contains the fix. ## Fix Fixed by commit `e403decb6e` (`nextcloud-talk: throttle repeated webhook auth failures`). OpenClaw thanks @AntAISecurityLab for reporting.

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Affected versions, risk and source history

cve-program · CVE-2026-33580

Published

OpenClaw

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "OpenClaw",
                    "product": "OpenClaw",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "2026.3.28",
                            "versionType": "semver"
                        },
                        {
                            "status": "unaffected",
                            "version": "2026.3.28",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/openclaw"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-17439

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 31, 2026, 2:10:33 PM

dateUpdated: Sep 24, 2026, 2:17:25 PM

1 related source bulletins · separate from aliases

WID-SEC-W-2026-0930: OpenClaw: Mehrere Schwachstellen

CVE-2026-33576 · CVE-2026-33577 · CVE-2026-33578 · CVE-2026-33579 · CVE-2026-33580 · CVE-2026-33581 · CVE-2026-34503 · CVE-2026-34504 · CVE-2026-41303 · CVE-2026-41332 · CVE-2026-41342 · CVE-2026-41344 · CVE-2026-41361 · CVE-2026-41367 · CVE-2026-41368 · CVE-2026-41371 · CVE-2026-41380 · CVE-2026-41395

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-33580

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-307

Original publisher date fields

published: 2026-03-31T15:16:15.170

lastModified: 2026-07-24T21:10:00.143

1 source CPE criteria · context only

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-9528-x887-j2fp

Published

openclaw

npm

SEMVER · introduced 0 → fixed 2026.3.28

Original source record · Cite this exact observation · Complete original publisher JSON