OpenClaw < 2026.5.12 - Custom Header Leakage via MCP Streamable HTTP Cross-Origin Redirects
Priority LOW 26CWE-522Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-522.
Summary
OpenClaw before 2026.5.12 contains an information disclosure vulnerability in streamable-http MCP servers that forwards operator-configured custom headers during cross-origin redirects. Attackers controlling or compromising an MCP endpoint can redirect requests to exfiltrate sensitive headers like API keys or tenant-routing credentials to attacker-controlled origins.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Fix Fixed OpenClaw (OpenClaw): 2026.5.12openclaw (npm): 2026.5.12
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenClaw | OpenClaw | before 2026.5.12 | 2026.5.12 | Patch available | CNA |
| — | openclaw (npm) | before 2026.5.12 | 2026.5.12 | Patch available | GHSA-rjxq-qqhf-8hwh |
- OpenClaw VendorOpenClaw Affected before 2026.5.12 Fixed in 2026.5.12 Patch available CNA
- openclaw (npm) Vendor— Affected before 2026.5.12 Fixed in 2026.5.12 Patch available GHSA-rjxq-qqhf-8hwh
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:* | before 2026.5.12 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta1:*:*:*:node.js:*:* | 2026.5.12 beta1 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta2:*:*:*:node.js:*:* | 2026.5.12 beta2 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta3:*:*:*:node.js:*:* | 2026.5.12 beta3 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta4:*:*:*:node.js:*:* | 2026.5.12 beta4 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta5:*:*:*:node.js:*:* | 2026.5.12 beta5 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta6:*:*:*:node.js:*:* | 2026.5.12 beta6 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta7:*:*:*:node.js:*:* | 2026.5.12 beta7 | Vulnerable | OpenClaw |
| cpe:2.3:a:openclaw:openclaw:2026.5.12:beta8:*:*:*:node.js:*:* | 2026.5.12 beta8 | Vulnerable | OpenClaw |
- cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:* Versions before 2026.5.12 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta1:*:*:*:node.js:*:* Versions 2026.5.12 beta1 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta2:*:*:*:node.js:*:* Versions 2026.5.12 beta2 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta3:*:*:*:node.js:*:* Versions 2026.5.12 beta3 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta4:*:*:*:node.js:*:* Versions 2026.5.12 beta4 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta5:*:*:*:node.js:*:* Versions 2026.5.12 beta5 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta6:*:*:*:node.js:*:* Versions 2026.5.12 beta6 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta7:*:*:*:node.js:*:* Versions 2026.5.12 beta7 Vulnerable ·OpenClaw
- cpe:2.3:a:openclaw:openclaw:2026.5.12:beta8:*:*:*:node.js:*:* Versions 2026.5.12 beta8 Vulnerable ·OpenClaw
Remediation
- Fix · CNA OpenClaw (OpenClaw) Fixed in 2026.5.12
- Fix · GHSA-rjxq-qqhf-8hwh openclaw (npm) Fixed in 2026.5.12 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
OpenClaw 2026.5.12
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2026-38862 OpenClaw < 2026.5.12 - Allowlist Bypass in Shell Inline-Command ParsingPriority LOW 35
- TI-2026-38849 OpenClaw < 2026.5.12 - Argument Pattern Bypass in Exec Allowlist via Linux and macOSPriority LOW 35
- TI-2026-38847 OpenClaw < 2026.5.12 - Slack Reaction Event Notification BypassPriority LOW 33
Timeline
- 2026-10-02 Threatist record created from CVE-2026-53840
- 2026-10-03 Alias added: GHSA-rjxq-qqhf-8hwh
References
More Openclaw vulnerabilities
- TI-2026-25309 OpenClaw < 2026.3.28 Media Parsing Path Traversal to Arbitrary File Read CVSS 4.0HIGH 8.7
- TI-2026-20394 Exposure of resource to wrong sphere in OpenClaw CVSS 3.1HIGH 8.8
- TI-2026-27742 OpenClaw < 2026.3.24 - Arbitrary Code Execution via .npmrc in Local Plugin/Hook Installation CVSS 4.0HIGH 8.4
- TI-2026-27766 OpenClaw < 2026.3.24 - Denial of Service via Feishu Webhook Pre-Auth Body Parsing CVSS 4.0MEDIUM 6.9
- TI-2026-07315 OpenClaw bluebubbles Webhook monitor.ts handleBlueBubblesWebhookRequest improper authentication CVSS 4.0MEDIUM 6.9
- TI-2026-17789 OpenClaw < 2026.2.22 - Allowlist Bypass via Command Substitution in system.run CVSS 4.0HIGH 7.5
Sources
- CVE-2026-53840 · CVE Program
- CVE-2026-53840 · NVD
- FIRST EPSS
- GHSA-rjxq-qqhf-8hwh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences