CVE•Published 2026-07-28•Modified 2026-09-09•1 article on news•5 live references•NVD data
CVE-2026-54603
Vulnerability data via NVD (ingested)
CVSS v3.1
8.6
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS percentile
29
Exploit Prediction Scoring System · top 71% of all CVEs
Weaknesses (CWE)
Description
OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect (OIDC). From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Client#request overrides the request authority, so the bearer Authorization header is sent to an attacker-controlled host, leaking the credential. This issue is fixed in version 2.0.22.
Timeline
Published 2026-07-28
Modified 2026-09-09
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common). Live host counts are a Premium feature.
More intel sources (5)
Shodan report
vuln:CVE-2026-54603Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-54603Censys host search filtered to this CVE id.
grep.app
CVE-2026-54603Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-54603GitHub code search for direct mentions.
Google dork
"CVE-2026-54603" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-54603 on GitHub.