{"id":"CVE-2026-43946","aliases":["EUVD-2026-46442","GHSA-fwcm-rqvw-j3p7"],"status":"published","title":"FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue","description":"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.","severity":{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00567,"percentile":0.47294,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-863"],"published":"2026-05-26T23:41:45Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"npm","package":"fuxa-server","fixed_in":["1.3.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"fuxa-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.3.0"},{"last_affected":"1.3.0"},{"fixed":"1.3.1"}]}],"versions":["1.3.0"]},{"source":"osv","ecosystem":"npm","package":"fuxa-server","ranges":[{"type":"SEMVER","events":[{"introduced":"1.3.0"},{"fixed":"1.3.1"}]}],"versions":["1.3.0"]}],"products":[{"vendor":"frangoteam","product":"fuxa"}],"references":[{"url":"https://github.com/frangoteam/FUXA/security/advisories/GHSA-fwcm-rqvw-j3p7","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/frangoteam/FUXA/pull/2260","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/frangoteam/FUXA/commit/78534da61a91613712b44bb63c8d7da8c5df5ca4","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/frangoteam/FUXA/releases/tag/v1.3.1","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-fwcm-rqvw-j3p7"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43946.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43946","tags":["advisory"]},{"url":"https://github.com/frangoteam/FUXA","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-43946","title":"FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue","description":"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.","status":"published","published":"2026-07-21T21:27:29.248Z","modified":"2026-07-22T15:02:58.663Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T13:37:25.103021Z"}],"euvd":[{"id":"EUVD-2026-46442","description":"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.","status":"published","published":"2026-07-21T21:27:29Z","modified":"2026-07-22T15:02:58Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:19:45.882146Z"}],"ghsa":[{"id":"GHSA-fwcm-rqvw-j3p7","title":"FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue","description":"### Summary\n An authorization bypass in the /api/getTagValue endpoint allows unauthenticated access to tag values when the referenced script does not exist.\n\n  ### Details\n  The issue is caused by the combination of these code paths:\n\n  - `server/api/apikeys/verify-api-or-token.js:45` sends requests without `x-api-key` to `authJwt.verifyToken(req, res, next)`.\n  - `server/api/jwt-helper.js:46-64` creates a signed guest token when no `x-access-token` is provided:\n    `if (!token) { token = getGuestToken(); }`\n    and then populates `req.userId` / `req.userGroups` from that guest token.\n  - `server/api/command/index.js:76-105` exposes `/api/getTagValue`.\n  - `server/runtime/scripts/index.js:106-111` returns `true` when the referenced script does not exist:\n    `if (!script) { return true; }`\n\n  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.\n\n  ### PoC\n\nRequests to /api/getTagValue without authentication could succeed when the authorization logic evaluated a non-existent sourceScriptName as authorized.","status":"published","published":"2026-05-26T23:41:45Z","modified":"2026-05-26T23:41:46Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:40:13.628377Z"}],"nvd":[{"id":"CVE-2026-43946","description":"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.","status":"published","published":"2026-07-21T22:17:01.41Z","modified":"2026-10-24T19:10:00.127Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:31.394335Z"}],"osv":[{"id":"CVE-2026-43946","title":"FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue","description":"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.","status":"published","published":"2026-07-21T21:27:29.248Z","modified":"2026-10-28T02:30:49.08113043Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:45:04.820169Z"},{"id":"GHSA-fwcm-rqvw-j3p7","title":"FUXA has an unauthenticated arbitrary tag value disclosure via /api/getTagValue","description":"### Summary\n An authorization bypass in the /api/getTagValue endpoint allows unauthenticated access to tag values when the referenced script does not exist.\n\n  ### Details\n  The issue is caused by the combination of these code paths:\n\n  - `server/api/apikeys/verify-api-or-token.js:45` sends requests without `x-api-key` to `authJwt.verifyToken(req, res, next)`.\n  - `server/api/jwt-helper.js:46-64` creates a signed guest token when no `x-access-token` is provided:\n    `if (!token) { token = getGuestToken(); }`\n    and then populates `req.userId` / `req.userGroups` from that guest token.\n  - `server/api/command/index.js:76-105` exposes `/api/getTagValue`.\n  - `server/runtime/scripts/index.js:106-111` returns `true` when the referenced script does not exist:\n    `if (!script) { return true; }`\n\n  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.\n\n  ### PoC\n\nRequests to /api/getTagValue without authentication could succeed when the authorization logic evaluated a non-existent sourceScriptName as authorized.","status":"published","published":"2026-05-26T23:41:45Z","modified":"2026-05-26T23:56:24.98305Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:46:47.119724Z"}]}}