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CVE-2026-28476

OpenClaw < 2026.2.14 - Server-Side Request Forgery in Tlon Extension Authentication

6.3 MediumFix available

OpenClaw versions prior to 2026.2.14 contain a server-side request forgery vulnerability in the optional Tlon Urbit extension that accepts user-provided base URLs for authentication without proper validation. Attackers who can influence the configured Urbit URL can induce the gateway to make HTTP requests to arbitrary hosts including internal addresses.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.28%Up 0.2 points since Mar 6, 2026
90%50%10%1%

What each source reports

CVE List Score used6.3

OpenClaw < 2026.2.14 - Server-Side Request Forgery in Tlon Extension Authentication

OpenClaw versions prior to 2026.2.14 contain a server-side request forgery vulnerability in the optional Tlon Urbit extension that accepts user-provided base URLs for authentication without proper validation. Attackers who can influence the configured Urbit URL can induce the gateway to make HTTP requests to arbitrary hosts including internal addresses.

Record
CVE-2026-28476
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
CVSS 3.1
8.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-918
Updated
2026-11-02
EUVDEUVD-2026-99226.3

OpenClaw versions prior to 2026.2.14 contain a server-side request forgery vulnerability in the optional Tlon Urbit extension that accepts user-provided base URLs for authentication without proper validation. Attackers who can influence the configured Urbit URL can induce the gateway to make HTTP requests to arbitrary hosts including internal addresses.

Record
EUVD-2026-9922
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-pg2v-8xwh-qhcc6.3

OpenClaw affected by SSRF in optional Tlon (Urbit) extension authentication

Summary

The optional Tlon (Urbit) extension previously accepted a user-provided base URL for authentication and used it to construct an outbound HTTP request, enabling server-side request forgery (SSRF) in affected deployments.

Impact

This only affects deployments that have installed and configured the Tlon (Urbit) extension, and where an attacker can influence the configured Urbit URL. Under those conditions, the gateway could be induced to make HTTP requests to attacker-chosen hosts (including internal addresses).

Deployments that do not use the Tlon extension, or where untrusted users cannot change the Urbit URL, are not impacted.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <= 2026.2.13

Fixed Versions

  • 2026.2.14 (planned next release)

Fix Commit(s)

  • bfa7d21e997baa8e3437657d59b1e296815cc1b1

Details

Urbit authentication now validates and normalizes the base URL and uses an SSRF guard that blocks private/internal hosts by default (opt-in: channels.tlon.allowPrivateNetwork).

Release Process Note

This advisory is pre-populated with the planned patched version (2026.2.14). After openclaw@2026.2.14 is published to npm, publish this advisory without further edits.

Thanks @p80n-sec for reporting.

Record
GHSA-pg2v-8xwh-qhcc
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
CVSS 3.1
8.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-918
Updated
2026-11-02
NVD6.3

OpenClaw versions prior to 2026.2.14 contain a server-side request forgery vulnerability in the optional Tlon Urbit extension that accepts user-provided base URLs for authentication without proper validation. Attackers who can influence the configured Urbit URL can induce the gateway to make HTTP requests to arbitrary hosts including internal addresses.

Record
CVE-2026-28476
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS 3.1
5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSV6.3

OpenClaw < 2026.2.14 - Server-Side Request Forgery in Tlon Extension Authentication

OpenClaw versions prior to 2026.2.14 contain a server-side request forgery vulnerability in the optional Tlon Urbit extension that accepts user-provided base URLs for authentication without proper validation. Attackers who can influence the configured Urbit URL can induce the gateway to make HTTP requests to arbitrary hosts including internal addresses.

Record
CVE-2026-28476
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
Weakness
CWE-918
Updated
2026-11-02
OSVGHSA-pg2v-8xwh-qhcc6.3

OpenClaw affected by SSRF in optional Tlon (Urbit) extension authentication

Summary

The optional Tlon (Urbit) extension previously accepted a user-provided base URL for authentication and used it to construct an outbound HTTP request, enabling server-side request forgery (SSRF) in affected deployments.

Impact

This only affects deployments that have installed and configured the Tlon (Urbit) extension, and where an attacker can influence the configured Urbit URL. Under those conditions, the gateway could be induced to make HTTP requests to attacker-chosen hosts (including internal addresses).

Deployments that do not use the Tlon extension, or where untrusted users cannot change the Urbit URL, are not impacted.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <= 2026.2.13

Fixed Versions

  • 2026.2.14 (planned next release)

Fix Commit(s)

  • bfa7d21e997baa8e3437657d59b1e296815cc1b1

Details

Urbit authentication now validates and normalizes the base URL and uses an SSRF guard that blocks private/internal hosts by default (opt-in: channels.tlon.allowPrivateNetwork).

Release Process Note

This advisory is pre-populated with the planned patched version (2026.2.14). After openclaw@2026.2.14 is published to npm, publish this advisory without further edits.

Thanks @p80n-sec for reporting.

Record
GHSA-pg2v-8xwh-qhcc
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
CVSS 3.1
8.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-918
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openclaw
npm
before 2026.2.14
2026.2.14

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-28476 is a medium vulnerability (CVSS 6.3) in Openclaw, published February 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in openclaw 2026.2.14.

References

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