Mitsuhiro Shibuya

7 exploits Active since Nov 2023
CVE-2026-44587 WRITEUP MEDIUM WRITEUP
CarrierWave has a denylisted_content_type bypass via Unescaped Regex Metacharacters
CarrierWave is a framework to upload files from Ruby applications. In versions prior to 2.2.7 and 3.1.3, the content_type_denylist check fails to escape regex metacharacters in string entries, causing the denylist to silently not match the content types it is intended to block. In lib/carrierwave/uploader/content_type_denylist.rb:57, denylist entries are interpolated directly into a regex without Regexp.quote or anchoring, so an entry such as image/svg+xml becomes the pattern /image\/svg+xml/, in which + is treated as a quantifier rather than a literal character and therefore never matches the real MIME type image/svg+xml. This is inconsistent with the allowlist implementation, which correctly applies both Regexp.quote and a \A anchor. Other content types containing regex metacharacters, such as application/xhtml+xml, are affected as well. As a result, any application that relies on content_type_denylist to block image/svg+xml, most commonly to prevent stored XSS, is silently unprotected. An attacker can upload an SVG file containing arbitrary JavaScript; if the application serves that SVG inline from its own origin, the script executes in the victim's browser, resulting in stored XSS. This issue has been fixed in versions 2.2.7 and 3.1.3.
CVSS 4.7
CVE-2026-44587 WRITEUP MEDIUM WRITEUP
CarrierWave has a denylisted_content_type bypass via Unescaped Regex Metacharacters
CarrierWave is a framework to upload files from Ruby applications. In versions prior to 2.2.7 and 3.1.3, the content_type_denylist check fails to escape regex metacharacters in string entries, causing the denylist to silently not match the content types it is intended to block. In lib/carrierwave/uploader/content_type_denylist.rb:57, denylist entries are interpolated directly into a regex without Regexp.quote or anchoring, so an entry such as image/svg+xml becomes the pattern /image\/svg+xml/, in which + is treated as a quantifier rather than a literal character and therefore never matches the real MIME type image/svg+xml. This is inconsistent with the allowlist implementation, which correctly applies both Regexp.quote and a \A anchor. Other content types containing regex metacharacters, such as application/xhtml+xml, are affected as well. As a result, any application that relies on content_type_denylist to block image/svg+xml, most commonly to prevent stored XSS, is silently unprotected. An attacker can upload an SVG file containing arbitrary JavaScript; if the application serves that SVG inline from its own origin, the script executes in the victim's browser, resulting in stored XSS. This issue has been fixed in versions 2.2.7 and 3.1.3.
CVSS 4.7
CVE-2023-49090 WRITEUP MEDIUM WRITEUP
CarrierWave < 2.2.5, >=3.0.0 <3.0.5 - Cross-Site Scripting via Content-Type Allowlist Bypass
CarrierWave is a solution for file uploads for Rails, Sinatra and other Ruby web frameworks. CarrierWave has a Content-Type allowlist bypass vulnerability, possibly leading to XSS. The validation in `allowlisted_content_type?` determines Content-Type permissions by performing a partial match. If the `content_type` argument of `allowlisted_content_type?` is passed a value crafted by the attacker, Content-Types not included in the `content_type_allowlist` will be allowed. This issue has been patched in versions 2.2.5 and 3.0.5.
CVSS 6.8
CVE-2024-39308 WRITEUP MEDIUM WRITEUP
rails_admin < 2.3.0 and >=3.0.0.beta <3.1.3 - Cross-Site Scripting via List View HTML Title Attribute
RailsAdmin is a Rails engine that provides an interface for managing data. RailsAdmin list view has the XSS vulnerability, caused by improperly-escaped HTML title attribute. Upgrade to 3.1.3 or 2.2.2 (to be released).
CVSS 5.4
CVE-2023-49090 WRITEUP MEDIUM WRITEUP
CarrierWave < 2.2.5, >=3.0.0 <3.0.5 - Cross-Site Scripting via Content-Type Allowlist Bypass
CarrierWave is a solution for file uploads for Rails, Sinatra and other Ruby web frameworks. CarrierWave has a Content-Type allowlist bypass vulnerability, possibly leading to XSS. The validation in `allowlisted_content_type?` determines Content-Type permissions by performing a partial match. If the `content_type` argument of `allowlisted_content_type?` is passed a value crafted by the attacker, Content-Types not included in the `content_type_allowlist` will be allowed. This issue has been patched in versions 2.2.5 and 3.0.5.
CVSS 6.8
CVE-2024-29034 WRITEUP MEDIUM WRITEUP
CarrierWave < 2.2.6 and 3.0.0-3.0.7 - Cross-Site Scripting via Content-Type Header Bypass
CarrierWave is a solution for file uploads for Rails, Sinatra and other Ruby web frameworks. The vulnerability CVE-2023-49090 wasn't fully addressed. This vulnerability is caused by the fact that when uploading to object storage, including Amazon S3, it is possible to set a Content-Type value that is interpreted by browsers to be different from what's allowed by `content_type_allowlist`, by providing multiple values separated by commas. This bypassed value can be used to cause XSS. Upgrade to 3.0.7 or 2.2.6.
CVSS 6.8
CVE-2024-39308 WRITEUP MEDIUM WRITEUP
rails_admin < 2.3.0 and >=3.0.0.beta <3.1.3 - Cross-Site Scripting via List View HTML Title Attribute
RailsAdmin is a Rails engine that provides an interface for managing data. RailsAdmin list view has the XSS vulnerability, caused by improperly-escaped HTML title attribute. Upgrade to 3.1.3 or 2.2.2 (to be released).
CVSS 5.4