JWT Handler Vulnerability in FastCMS Affects Security Standards
CVE-2025-3177

2.3LOW

Key Information:

Vendor
FastCMS
Status
Fastcms
Vendor
CVE Published:
3 April 2025

Badges

👾 Exploit Exists🟡 Public PoC

Summary

A vulnerability has been identified in FastCMS version 0.1.5 concerning its JWT Handler, which erroneously implements a hard-coded cryptographic key. This flaw can compromise the integrity of authentication processes, potentially enabling attackers to perform unauthorized actions. As the vulnerability can be exploited remotely, it raises serious security concerns, particularly regarding identity forgery. The exploit, although complex, has been made public, inviting scrutiny and prompting immediate attention from affected users and administrators.

Affected Version(s)

FastCMS 0.1.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-3177 - Proof of Concept

References

https://vuldb.com/?id.303136
vdb-entry
https://vuldb.com/?ctiid.303136
signaturepermissions-required
https://vuldb.com/?submit.543673
third-party-advisory

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Unnlucky1 (VulDB User)
.