ADVISORIES
GEM
FRAMEWORK
SEVERITY
CVSS v3.x: 6.1 (Medium)
UNAFFECTED VERSIONS
- < 6.0.0
PATCHED VERSIONS
- >= 6.0.3.4
DESCRIPTION
There is a possible XSS vulnerability in Action Pack while the application server is in development mode. This vulnerability is in the Actionable Exceptions middleware. This vulnerability has been assigned the CVE identifier CVE-2020-8264.
Versions Affected: >= 6.0.0 Not affected: < 6.0.0 Fixed Versions: 6.0.3.4
Impact
When an application is running in development mode, and attacker can send or embed (in another page) a specially crafted URL which can allow the attacker to execute JavaScript in the context of the local application.
Workarounds
Until such time as the patch can be applied, application developers should disable the Actionable Exceptions middleware in their development environment via a line such as this one in their config/environment/development.rb:
config.middleware.delete ActionDispatch::ActionableExceptions