CVE-2019-11027

Ruby OpenID (aka ruby-openid) through 2.8.0 has a remotely exploitable flaw. This library is used by Rails web applications to integrate with OpenID Providers. Severity can range from medium to critical, depending on how a web application developer chose to employ the ruby-openid library. Developers who based their OpenID integration heavily on the "example app" provided by the project are at highest risk.

Published: 2019-06-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-11027 is rated High Risk (70.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.91%). EPSS rose +1.18% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-11027

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.73% 2.91% +1.18%
2 2026-05-11 1.83% 1.73% -0.10%
3 2025-03-30 — 1.83% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-11027

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2019-11027

GitHub Security Advisory for CVE-2019-11027

GHSA-fqfj-cmh6-hj49 · Severity: critical · Ecosystem: rubygems — ruby-openid SSRF via claimed_id request

OS Trackers for CVE-2019-11027

vendor priority summary link
debian not yet assigned CVE-2019-11027 not yet assigned priority: Debian including 1 source packages (ruby-openid), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-11027
gentoo high CVE-2019-11027: 1 GLSA(s) (202003-09), 1 atom(s) (dev-ruby/ruby-openid); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-11027
redhat medium — https://access.redhat.com/security/cve/CVE-2019-11027
ubuntu medium CVE-2019-11027 medium priority: Ubuntu including 1 source packages (ruby-openid), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 12, deferred 2, DNE 1, released 1. https://ubuntu.com/security/CVE-2019-11027

Affected software / configurations for CVE-2019-11027

Vendor Product Version Raw CPE
openid ruby-openid <= 2.8.0 cpe:2.3:a:openid:ruby-openid:*:*:*:*:*:*:*:*

References for CVE-2019-11027

cvelogic Threat Intelligence