GHSA-pg2v-8xwh-qhcc — medium GitHub Advisory (CVE-2026-28476) in npm/openclaw

Description

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 [email protected] is published to npm, publish this advisory without further edits.

Thanks @p80n-sec for reporting.

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-02-18 00:55:00 UTC
Updated: 2026-04-27 16:46:07 UTC
GitHub reviewed: 2026-02-18 00:55:00 UTC
NVD published: 2026-03-05

Score	Percentile
0.09%	25.37%

CVSS Scores

Base score	Version	Severity	Vector
8.3	3.1	—	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.
6.3	4.0	—	`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:P) Additional preconditions must be present for exploitation. Privileges required (PR:N) No privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:N) No confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:L) Limited integrity impact on the vulnerable system. Vulnerable system availability impact (VA:N) No availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:L) Limited confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:L) Limited integrity impact on subsequent systems. Subsequent system availability impact (SA:L) Limited availability impact on subsequent systems.

Identifiers

Type	Value
GHSA	GHSA-pg2v-8xwh-qhcc ↗
CVE	CVE-2026-28476 ↗

CWEs

CWE id	Name
CWE-918	Server-Side Request Forgery (SSRF)

Credits

p80n-sec (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
npm	openclaw	< 2026.2.14	2026.2.14	—

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