Open Redirect in Authelia
CVE-2021-29456
Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier, utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain, including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround, one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Authelia — versions <= 4.27.4
Weakness classification (CWE)
References
- github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-29456?
- CVE-2021-29456 is a medium-severity vulnerability in Authelia, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.7/10. Published 2021-04-21.
- How severe is CVE-2021-29456?
- Medium severity. CVSS v3 base score is 5.7 out of 10.