Open Redirect in Thoughtbot Clearance
CVE-2021-23435
This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Thoughtbot Clearance
- Clearance — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- snyk.io/vuln/SNYK-RUBY-CLEARANCE-1577284 (Third Party Advisory)
- github.com/thoughtbot/clearance/pull/945 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-23435?
- CVE-2021-23435 is a high-severity vulnerability in Thoughtbot Clearance, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 7.6/10. Published 2021-09-12.
- How severe is CVE-2021-23435?
- High severity. CVSS v3 base score is 7.6 out of 10.
- Is CVE-2021-23435 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.