PT-2026-43446 · Npm · Fuxa-Server

Published

2026-05-26

·

Updated

2026-05-27

·

CVE-2026-43946

CVSS v4.0

7.7

High

VectorAV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

Summary

An authorization bypass in the /api/getTagValue endpoint allows unauthenticated access to tag values when the referenced script does not exist.

Details

The issue is caused by the combination of these code paths:
  • server/api/apikeys/verify-api-or-token.js:45 sends requests without x-api-key to authJwt.verifyToken(req, res, next).
  • server/api/jwt-helper.js:46-64 creates a signed guest token when no x-access-token is provided: if (!token) { token = getGuestToken(); } and then populates req.userId / req.userGroups from that guest token.
  • server/api/command/index.js:76-105 exposes /api/getTagValue.
  • server/runtime/scripts/index.js:106-111 returns true when the referenced script does not exist: if (!script) { return true; }
As a result, an unauthenticated request reaches /api/getTagValue as guest, and the authorization check is bypassed because isAuthorisedByScriptName() returns true when sourceScriptName is omitted or does not match a real script. The endpoint then returns arbitrary tag values by ID.

PoC

Requests to /api/getTagValue without authentication could succeed when the authorization logic evaluated a non-existent sourceScriptName as authorized.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-43946
GHSA-FWCM-RQVW-J3P7

Affected Products

Fuxa-Server