CVE-2026-3963 perfree go-fastdfs-web Apache Shiro RememberMe ShiroConfig.java rememberMeManager hard-coded key
An attacker can bypass authentication in go-fastdfs-web by exploiting a hard-coded cryptographic key in the Apache Shiro RememberMe configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3963?
CVE-2026-3963 is a medium-severity vulnerability in perfree go-fastdfs-web, published on 11 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security flaw has been discovered in perfree go-fastdfs-web up to 1.3.7. This affects the function rememberMeManager of the file src/main/java/com/perfree/config/ShiroConfig.java of the component Apache Shiro RememberMe. Performing a manipulation results in use of hard-coded cryptographic key . The attack can be initiated remotely. The complexity of an attack is rather high. The exploitability is reported as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-3963?
How do I fix CVE-2026-3963?
No fix has been published for CVE-2026-3963 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3963 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3963 exists.
Sources
Also known as GHSA-6mp3-5629-4c3x.