CVE-2026-43946Published

FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-43946

Published

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Version 1.3.0 has an authorization bypass in the /api/getTagValue endpoint allows unauthenticated access to tag values when the referenced script does not exist. Version 1.3.1 patches the issue.

Source published: 21 Jul 2026 21:27:29 UTC
Source modified: 22 Jul 2026 15:02:58 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

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CVSS 4.0 · 7.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

euvd · EUVD-2026-46442

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 21, 2026, 9:27:29 PM

dateUpdated: Jul 22, 2026, 3:02:58 PM

Source published: Jul 21, 2026, 9:27:29 PM (timezone not stated)
Source modified: Jul 22, 2026, 3:02:58 PM (timezone not stated)
Observed here: 7 Nov 2026 09:37:33 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 7.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

nvd · CVE-2026-43946

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-863

Original publisher date fields

published: 2026-07-21T22:17:01.410

lastModified: 2026-10-24T19:10:00.127

Source published: 21 Jul 2026 22:17:01 UTC
Source modified: 24 Oct 2026 19:10:00 UTC
Observed here: 25 Oct 2026 10:17:21 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 7.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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

osv · GHSA-fwcm-rqvw-j3p7

Published

### 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.

Source published: 26 May 2026 23:41:45 UTC
Source modified: 26 May 2026 23:56:24 UTC
Observed here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

Publisher rating · HIGH