| Package | Affected versions | Patched versions |
|---|---|---|
| fuxa-server | ≥ 1.3.0, < 1.3.1 | 1.3.1 |
An authorization bypass in the /api/getTagValue endpoint allows unauthenticated access to tag values when the referenced script does not exist.
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.
Requests to /api/getTagValue without authentication could succeed when the authorization logic evaluated a non-existent sourceScriptName as authorized.
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