CVE-2025-43863 vantage6 lacks brute-force protection on change password functionality
An attacker with an authenticated session can brute-force user passwords via the change password endpoint due to missing rate limiting.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-43863?
CVE-2025-43863 is a low-severity vulnerability in vantage6, published on 12 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
vantage6 is an open source framework built to enable, manage and deploy privacy enhancing technologies like Federated Learning and Multi-Party Computation. If attacker gets access to an authenticated session, they can try to brute-force the user password by using the change password functionality: they can call that route infinitely which will return the message that password is wrong until it is correct. This vulnerability is fixed in 4.11.
Weakness: CWE-307
Which versions are affected by CVE-2025-43863?
3 open source packages ship an affected version, including vantage6. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vantage6 PyPI | All versions | 4.11.0 |
vantage6 PyPI | All versions | 4.11.0 |
vantage6 PyPI | All versions | 4.11.0 |
Products include Vantage6 Vantage6.
How do I fix CVE-2025-43863?
Upgrade vantage6 to 4.11.0 or later.
Is CVE-2025-43863 being exploited?
There is no known exploitation of CVE-2025-43863 in the wild and no public exploit code.
Other vulnerabilities in vantage6
- CVE-2024-21649 Remote code execution
- CVE-2023-23929 Refresh tokens do not expire in Vantage6
- CVE-2023-47631 vantage6 Node accepts non-whitelisted algorithms from malicious server
- CVE-2024-21653 vantage6 insecure SSH configuration for node and server containers
- CVE-2023-22738 Improper Preservation of Permissions in vantage6
Sources
Also known as GHSA-j6g5-p62x-58hw, PYSEC-2025-220.