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CVE-2020-36599

31
FAUCET Score

CVE-2020-36599 describes a critical vulnerability in OmniAuth versions prior to 1.9.2 and 2.0, specifically an improper neutralization of input in lib/omniauth/failure_endpoint.rb, affecting the message_key value. With a CVSS score of 9.8 (Critical), this vulnerability is remotely exploitable with low attack complexity, allowing for high impact on confidentiality, integrity, and availability without user interaction or privileges. While the vulnerability is severe, there is currently no evidence of active exploitation, publicly available exploit code in common repositories like Metasploit or ExploitDB, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.9.2CPE matchmatch criteria
cpe:2.3:a:omniauth:omniauth:*:*:*:*:*:-:*:*
2.0.0CPE matchmatch criteria
cpe:2.3:a:omniauth:omniauth:2.0.0:pre.rc1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.06%
Probability of exploitation in next 30 days
EPSS Percentile
60.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 46th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: omniauthFixed in: 1.9.2
rubygemspatch availablevia ghsa
Product: omniauthFixed in: 2.0.0

Vendor Advisories (1)

rubygemsGHSA-pm55-qfxr-h247critical

OmniAuth's `lib/omniauth/failure_endpoint.rb` does not escape `message_key` value

Aug 19, 2022

References

github.com / omniauth/omniauth/commit/43a396f181ef7d0ed2ec8291c939c95e3ed3ff00
PatchThird Party Advisory
rubygems.org / gems/omniauth/versions/1.9.2
Product