Bug 2517886 (CVE-2026-75886)

Summary:	CVE-2026-75886 openshift/console: openshift/console: Unauthenticated reverse proxy to in-cluster catalogd service with session token forwarding
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, security-response-team, sghai, sidsharm, suppawar, vlaad
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in openshift/console. An unauthenticated remote attacker can exploit a misconfiguration in the CatalogdHandler, which lacks proper authentication, and the forwarding of the `openshift-session-token` cookie. This allows the attacker to send requests to the in-cluster catalogd service, leading to the disclosure of the internal operator-catalog index and providing a relay into the openshift-catalogd namespace.	Story Points:	---
Clone Of:		Environment:
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-18 13:11:32 UTC

The CatalogdHandler() in the OpenShift console is registered without authHandler (pkg/server/server.go:340). Furthermore, the CatalogdProxyConfig is the only proxy config that omits HeaderBlacklist: srv.ProxyHeaderDenyList (cmd/bridge/main.go:429-432), so the user's openshift-session-token cookie is forwarded verbatim to the catalogd service.

Any unauthenticated network actor can GET /api/catalogd/<arbitrary-path> and the console pod will issue a TLS request to catalogd-service.openshift-catalogd.svc:443/<arbitrary-path>. This discloses the full operator-catalog index (intended to be cluster-internal) and provides a relay primitive into the openshift-catalogd namespace.

Tested and reproduced on OCP 5.0 nightly cluster.

Upstream: https://github.com/openshift/console
File: pkg/server/server.go:340, pkg/server/server.go:859-868, cmd/bridge/main.go:429-432