CVE-2026-102339
Description
A flaw was found in Telepresence. The Traffic Manager Tunnel service processes session identifiers from caller-controlled messages without verifying that the caller owns the active session. An attacker who obtains a valid session identifier can connect to the tunnel endpoint to hijack another user's session, gaining unauthorized network routing access within the connected cluster.
Statement
This vulnerability is rated as Important severity because successful exploitation allows authenticated users to hijack active developer tunnels, bypassing network segmentation and gaining lateral cluster routing privileges. Although discovering an active session token requires prerequisites like log leakage or internal endpoint exposure rather than blind brute-force attacks, the resulting access grants the full routing capabilities of the compromised session across the cluster environment. Red Hat OpenShift and enterprise environments do not include Telepresence by default, restricting exposure to developer workflows where this tooling is explicitly integrated.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Access control checks for specific user data or functionality can be bypassed.
Access Control
Technical Impact: Gain Privileges or Assume Identity
Horizontal escalation of privilege is possible (one user can view/modify information of another user).
Access Control
Technical Impact: Gain Privileges or Assume Identity
Vertical escalation of privilege is possible if the user-controlled key is actually a flag that indicates administrator status, allowing the attacker to gain administrative access.
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