Information disclosure in Discourse Rails Multisite
CVE-2021-41263
rails_multisite provides multi-db support for Rails applications. In affected versions this vulnerability impacts any Rails applications using `rails_multisite` alongside Rails' signed/encrypted cookies. Depending on how the application makes use of these cookies, it may be possible for an attacker to re-use cookies on different 'sites' within a multi-site Rails application. The issue has been patched in v4 of the `rails_multisite` gem. Note that this upgrade will invalidate all previous signed/encrypted cookies. The impact of this invalidation will vary based on the application architecture.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- Discourse Rails Multisite — versions < 4.0.0
Weakness classification (CWE)
References
- github.com/discourse/rails_multisite/security/advisories/GHSA-844m-cpr9-jcmh (Third Party Advisory)
- github.com/discourse/rails_multisite/commit/c6785cdb5c9277dd2c5ac8d55180dd1ece4… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-41263?
- CVE-2021-41263 is a high-severity vulnerability in Discourse Rails Multisite, classified under Information Disclosure. CVSS score: 8.3/10. Published 2021-11-15.
- How severe is CVE-2021-41263?
- High severity. CVSS v3 base score is 8.3 out of 10.