CVE-2016-11086
Improper Certificate Validation in oauth ruby gem
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
CVE-2016-11086- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
CVE List No score
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
CVE-2016-11086- Updated
- 2026-11-02
EUVDEUVD-2021-0781 No score
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
EUVD-2021-0781- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7359-3c6r-hfc2
Improper Certificate Validation in oauth ruby gem
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
GHSA-7359-3c6r-hfc2- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
OSV
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
CVE-2016-11086- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2016-11086
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
DEBIAN-CVE-2016-11086- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-7359-3c6r-hfc2
Improper Certificate Validation in oauth ruby gem
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
GHSA-7359-3c6r-hfc2- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2016-11086
lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.
- Record
UBUNTU-CVE-2016-11086- CVSS 3.1
- 7.4 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
oauthRubyGems |
before 0.5.5 | 0.5.5 |
ruby-oauthDebian:12 |
All versions, plus listed versions 0.5.4-1.10.5.6-11.1.7-11.1.8-1 |
None known |
ruby-oauthDebian:13 |
All versions, plus listed versions 0.5.4-1.10.5.6-11.1.7-11.1.8-1 |
None known |
ruby-oauthDebian:14 |
All versions, plus listed versions 0.5.4-1.10.5.6-11.1.7-11.1.8-1 |
None known |
oauthRubyGems |
before 0.5.5, plus listed versions 0.1.10.2.00.2.10.2.20.2.4 Show 23 moreShow less0.2.60.2.70.3.00.3.10.3.20.3.30.3.40.3.50.3.60.3.7.pre10.4.00.4.10.4.20.4.30.4.40.4.50.4.60.4.70.5.00.5.10.5.20.5.30.5.4 |
0.5.5 |
ruby-oauthUbuntu:16.04:LTS |
All versions, plus listed versions 0.4.7-3 |
None known |
ruby-oauthUbuntu:18.04:LTS |
All versions, plus listed versions 0.5.3-1 |
None known |
ruby-oauthUbuntu:20.04:LTS |
All versions, plus listed versions 0.5.4-1 |
None known |
ruby-oauthUbuntu:22.04:LTS |
All versions, plus listed versions 0.5.4-1.1 |
None known |
ruby-oauthUbuntu:24.04:LTS |
All versions, plus listed versions 0.5.4-1.1 |
None known |
ruby-oauthUbuntu:25.10 |
All versions, plus listed versions 0.5.4-1.1 |
None known |
ruby-oauthUbuntu:26.10 |
All versions, plus listed versions 0.5.4-1.11.1.7-11.1.8-1 |
None known |
ruby-oauthUbuntu:26.04:LTS |
All versions, plus listed versions 0.5.4-1.1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2016-11086 is a high vulnerability (CVSS 7.4) in Oauth-ruby Project Oauth-ruby, published September 24, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.86%, the 58th percentile. Fixed in oauth 0.5.5.