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CVE-2018-16477

22
FAUCET Score

CVE-2018-16477 is a bypass vulnerability in Active Storage versions 5.2.0 and later, specifically impacting Google Cloud Storage and Disk services within Ruby on Rails applications. An attacker can manipulate content-disposition and content-type parameters, potentially leading to the execution of malicious HTML files inline. This medium-severity vulnerability (CVSS 6.5) requires user interaction and could result in high integrity impact, including unauthorized access to private signed URLs when combined with other techniques. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.2.0, < 5.2.1.1CPE matchmatch criteria
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.31%
Probability of exploitation in next 30 days
EPSS Percentile
67.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0131 is in the 80th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rubygemspatch availablevia ghsa
Product: activestorageFixed in: 5.2.1.1

Vendor Advisories (1)

rubygemsGHSA-7rr7-rcjw-56vjmedium

Exposure of Sensitive Information to an Unauthorized Actor in activestorage

Dec 5, 2018

References

groups.google.com / d/msg/rubyonrails-security/3KQRnXDIuLg/mByx5KkqBAAJ
ExploitMailing ListMitigationThird Party Advisory
weblog.rubyonrails.org / 2018/11/27/Rails-4-2-5-0-5-1-5-2-have-been-released
Vendor Advisory