CVE-2021-27736 XML external entity in n/a
An attacker can exploit unsafe XML parsing in the fusionauth-samlv2 library to perform XXE attacks, potentially reading sensitive data or causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-27736?
CVE-2021-27736 is a medium-severity vulnerability in n/a, published on 22 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
FusionAuth fusionauth-samlv2 before 0.5.4 allows XXE attacks via a forged AuthnRequest or LogoutRequest because parseFromBytes uses javax.xml.parsers.DocumentBuilderFactory unsafely.
Weakness: CWE-611
Which versions are affected by CVE-2021-27736?
It affects 1 product.
Products include Fusionauth Saml V2.
How do I fix CVE-2021-27736?
No fix has been published for CVE-2021-27736 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-27736 being exploited?
There is no known exploitation of CVE-2021-27736 in the wild and no public exploit code.
Sources
Also known as GHSA-3jw3-99x8-h6xc.