CVE-2018-16477
Exposure of Sensitive Information to an Unauthorized Actor in activestorage
CVE-2018-16477 is a medium vulnerability (CVSS 6.5) in Rails Https://github.com/rails/rails, published November 30, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.31%, the 70th percentile. Fixed in activestorage 5.2.1.1.
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path. This vulnerability has been fixed in version 5.2.1.1.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
6.5
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path. This vulnerability has been fixed in version 5.2.1.1.
- Record
CVE-2018-16477- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path. This vulnerability has been fixed in version 5.2.1.1.
- Record
CVE-2018-16477- Weakness
- CWE-200
- Updated
- 2026-11-02
EUVDEUVD-2018-0801 No score
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path. This vulnerability has been fixed in version 5.2.1.1.
- Record
EUVD-2018-0801- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7rr7-rcjw-56vj
6.5
Exposure of Sensitive Information to an Unauthorized Actor in activestorage
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path.
Vulnerable apps are those using either GCS or the Disk service in production. Other storage services such as S3 or Azure aren't affected.
- Record
GHSA-7rr7-rcjw-56vj- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
6.5
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path. This vulnerability has been fixed in version 5.2.1.1.
- Record
CVE-2018-16477- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-16477
6.5
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path. This vulnerability has been fixed in version 5.2.1.1.
- Record
DEBIAN-CVE-2018-16477- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-7rr7-rcjw-56vj
6.5
Exposure of Sensitive Information to an Unauthorized Actor in activestorage
A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the content-disposition and content-type parameters which can be used in with HTML files and have them executed inline. Additionally, if combined with other techniques such as cookie bombing and specially crafted AppCache manifests, an attacker can gain access to private signed URLs within a specific storage path.
Vulnerable apps are those using either GCS or the Disk service in production. Other storage services such as S3 or Azure aren't affected.
- Record
GHSA-7rr7-rcjw-56vj- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11328-1 No score
ruby2.7-rubygem-activestorage-5.2-5.2.6-1.2 on GA media
These are all security issues fixed in the ruby2.7-rubygem-activestorage-5.2-5.2.6-1.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11328-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11347-1 No score
ruby2.7-rubygem-rails-5.2-5.2.6-1.2 on GA media
These are all security issues fixed in the ruby2.7-rubygem-rails-5.2-5.2.6-1.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11347-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
activestorageRubyGems |
5.2.0 to 5.2.1.0 | 5.2.1.1 |
railsDebian:12 |
before 2:5.2.2+dfsg-1 | 2:5.2.2+dfsg-1 |
railsDebian:13 |
before 2:5.2.2+dfsg-1 | 2:5.2.2+dfsg-1 |
railsDebian:14 |
before 2:5.2.2+dfsg-1 | 2:5.2.2+dfsg-1 |
activestorageRubyGems |
5.2.0 up to 5.2.1.1, plus listed versions 5.2.15.2.1.rc1 |
5.2.1.1 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases, products | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
groups.google.com/d/msg/rubyonrails-security/3KQRnXDIuLg/mByx5KkqBAAJ
weblog.rubyonrails.org/2018/11/27/Rails-4-2-5-0-5-1-5-2-have-been-released
nvd.nist.gov/vuln/detail/CVE-2018-16477
github.com/advisories/GHSA-7rr7-rcjw-56vj
security-tracker.debian.org/tracker/CVE-2018-16477
suse.com/security/cve/CVE-2018-16477