EUVD-2026-51668
GHSA-pjp7-q6wp-97qx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered open redirect requiring low-privilege SSO context and user interaction; scope changes as victim browser escapes GeoNetwork origin to external phishing host.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
GeoNetwork is a catalog application to manage spatially referenced resources. From 3.12.0 until 4.2.16 and 4.4.11, unsafe redirect validation in GeonetworkOAuth2LoginAuthenticationFilter and KeycloakAuthenticationProcessingFilter permits an attacker-controlled external redirect after login. This issue is fixed in versions 4.2.16 and 4.4.11.
AnalysisAI
Post-login redirect validation in GeoNetwork's OAuth2/OIDC and Keycloak SSO authentication filters can be bypassed to redirect authenticated users to attacker-controlled external sites, enabling phishing attacks. Versions 3.12.0 through 4.2.15 and 4.4.0 through 4.4.10 are affected across both supported and archived release lines. The bypass exploits the filter's failure to reject protocol-relative URLs (e.g., //evil.example.com) that Java treats as relative paths but browsers resolve as absolute external destinations; no public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV.
Technical ContextAI
GeoNetwork is a Java-based geospatial catalog application (Maven artifact org.geonetwork-opensource:geonetwork, CPE cpe:2.3:a:geonetwork:core-geonetwork:*:*:*:*:*:*:*:*) built on Spring Security. The vulnerable logic resided in GeonetworkOAuth2LoginAuthenticationFilter and KeycloakAuthenticationProcessingFilter, which handle post-login redirect targets supplied via a client-controlled URL parameter. The original validation checked only whether the URL string started with '/' to classify it as a safe relative path; it did not account for protocol-relative URLs (//attacker.example.com), which pass the startsWith('/') check but cause browsers to issue a full cross-origin request. CWE-601 (URL Redirection to Untrusted Site / Open Redirect) precisely describes this class of insufficient allowlist validation. The fix, delivered in PRs #9307 and #9309, introduces a centralized RedirectUtil class that validates redirect targets against the configured server host, protocol, and port, explicitly rejecting protocol-relative and cross-origin absolute URLs in both login and logout flows.
RemediationAI
Upgrade to GeoNetwork 4.2.16 or 4.4.11, which are the vendor-released patched versions confirmed by GitHub release tags at https://github.com/geonetwork/core-geonetwork/releases/tag/4.2.16 and https://github.com/geonetwork/core-geonetwork/releases/tag/4.4.11. Instances running archived 3.x or 4.0.x lines will not receive a fix from the vendor and must migrate to a supported branch. Where immediate upgrade is not possible, a compensating control is to restrict access to the GeoNetwork SSO login endpoints (the OAuth2 and Keycloak callback URLs) at the network perimeter to trusted IP ranges, reducing the attacker's ability to deliver crafted login links to a broad victim pool; this does not eliminate the vulnerability but raises the delivery bar. A more disruptive workaround is to disable OAuth2/OIDC and Keycloak SSO entirely and revert to local authentication, which removes the vulnerable filter logic but breaks federated identity workflows for all users.
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