FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue
Published Jul 21, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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: - 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: 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.
Technical context
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: - 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: 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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Jul 21, 2026 · Last refreshed Nov 3, 2026