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CVE-2016-11086

21
FAUCET Score

CVE-2016-11086 describes a critical vulnerability in the oauth-ruby gem (versions through 0.5.4), specifically within lib/oauth/consumer.rb, where the software fails to verify server X.509 certificates if a certificate bundle is absent. This oversight enables man-in-the-middle (MITM) attackers to impersonate legitimate servers, potentially leading to the compromise of sensitive information. With a CVSS score of 7.4 (HIGH), this vulnerability is remotely exploitable with high attack complexity, allowing for significant confidentiality and integrity impacts. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.5.4CPE matchmatch criteria
cpe:2.3:a:oauth-ruby_project:oauth-ruby:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.1

7.4HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 20th percentile among its peer group of 8,913 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 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: oauthFixed in: 0.5.5

Vendor Advisories (1)

rubygemsGHSA-7359-3c6r-hfc2high

Improper Certificate Validation in oauth ruby gem

Apr 22, 2021

References

github.com / oauth-xx/oauth-ruby/issues/137
ExploitThird Party Advisory