Vulnerability-Lookup

GHSA-9528-X887-J2FP

Vulnerability from github – Published: 2026-03-31 23:59 – Updated: 2026-04-06 22:53

Summary

OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2026.3.24"
      },
      "package": {
        "ecosystem": "npm",
        "name": "openclaw"
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        }
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  "aliases": [
    "CVE-2026-33580"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-307"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-31T23:59:17Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nNextcloud Talk webhook signature failures were not throttled even though the integration relies on an operator-configured shared secret that may be weak.\n\n## Impact\n\nAn attacker who could reach the webhook endpoint could brute-force weak secrets online and then forge inbound webhook events.\n\n## Affected Component\n\n`extensions/nextcloud-talk/src/monitor.ts`\n\n## Fixed Versions\n\n- Affected: `\u003c= 2026.3.24`\n- Patched: `\u003e= 2026.3.28`\n- Latest stable `2026.3.28` contains the fix.\n\n## Fix\n\nFixed by commit `e403decb6e` (`nextcloud-talk: throttle repeated webhook auth failures`).\n\nOpenClaw thanks @AntAISecurityLab for reporting.",
  "id": "GHSA-9528-x887-j2fp",
  "modified": "2026-04-06T22:53:25Z",
  "published": "2026-03-31T23:59:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-9528-x887-j2fp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33580"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/e403decb6e20091b5402780a7ccd2085f98aa3cd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/releases/tag/v2026.3.28"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-rate-limiting-on-webhook-shared-secret-authentication"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "OpenClaw\u0027s Nextcloud Talk webhook missing rate limiting on shared secret authentication"
}

CVE-2026-33580 (GCVE-0-2026-33580)

Vulnerability from cvelistv5 – Published: 2026-03-31 14:10 – Updated: 2026-03-31 17:43

Title

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

Summary

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.

Severity

6.3 (Medium)


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

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-307 - Improper Restriction of Excessive Authentication Attempts

Assigner

VulnCheck

References

3 references

URL	Tags
https://github.com/openclaw/openclaw/security/adv…	third-party-advisory
https://github.com/openclaw/openclaw/commit/e403d…	patch
https://www.vulncheck.com/advisories/openclaw-bru…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
OpenClaw	OpenClaw	Affected: 0 , < 2026.3.28 (semver) Unaffected: 2026.3.28 (semver)

Date Public

2026-03-29 00:00

Credits

AntAISecurityLab

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-9528-X887-J2FP

Summary

Impact

Affected Component

Fixed Versions

Fix

CVE-2026-33580 (GCVE-0-2026-33580)

Tags

Sightings

Nomenclature