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.
CVE-2019-11027
CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.7%, top 17% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 9.8(medium)
- EPSS
- 85.3%
- KEV
- Not listed
Published
June 10, 2019
Last Modified
November 21, 2024
Advisory Details (4)
Auto-updated May 27, 2026Patch available.
generic
OpenID library for Ruby: Server-Side Request Forgery (GLSA 202003-09) — Gentoo security
https://security.gentoo.org/glsa/202003-09generic
'Re: [security] Security issue with ruby-openid library' - MARC
https://marc.info/?l=openid-security&m=155154717027534&w=2generic Patch Available
[SECURITY] [DLA 1956-1] ruby-openid security update
https://lists.debian.org/debian-lts-announce/2019/10/msg00014.htmlgeneric
Question concerning CVE-2019-11027 · Issue #122 · openid/ruby-openid · GitHub
https://github.com/openid/ruby-openid/issues/122Frequently asked(5)
What is CVE-2019-11027?
CVE-2019-11027 is a critical vulnerability published on June 10, 2019. 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.…
When was CVE-2019-11027 disclosed?
CVE-2019-11027 was first published in the National Vulnerability Database on June 10, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11027 actively exploited?
CVE-2019-11027 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-11027?
CVE-2019-11027 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-11027?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11027, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2019-11027
Is Your Infrastructure Affected by CVE-2019-11027?
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