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CVE-2026-78167 – Authentication Bypass – ipTIME T16000M 14.20.2

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Summary

CVE-2026-78167 is a critical improper authentication vulnerability in the EFM ipTIME T16000M router/switch, version 14.20.2. The flaw resides in the httpcon_check_session_url function of the device’s Session Validation Handler, allowing remote, unauthenticated attackers to bypass session validation. It carries the maximum CVSS v3.1 base score of 10.0, and a public proof-of-concept exploit is available.

Technical details

  • Root cause: The httpcon_check_session_url function in the Session Validation Handler component fails to properly validate session state, allowing session/authentication checks to be bypassed.
  • Trigger conditions: An attacker sends a crafted HTTP request to the device’s management interface that manipulates the session validation logic; no valid credentials or prior session are required.
  • Attack vector: Network-based, remotely exploitable with low attack complexity and no privileges or user interaction required.
  • Impact: Full compromise of confidentiality, integrity, and availability of the device is possible, consistent with the CVSS impact metrics (C:H/I:H/A:H) and the scope-changed (S:C) vector, indicating potential impact beyond the vulnerable component itself.

Affected software

  • EFM ipTIME T16000M, firmware version 14.20.2

Severity

  • CVSS v3.1 Base Score: 10.0 (CRITICAL)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor patch has been confirmed as of this writing; the vendor was reportedly contacted about the issue but did not respond. Check EFM/ipTIME’s official support channels for a firmware update addressing this issue and apply it as soon as it is released.
  • If no patch is available:
    • Do not expose the ipTIME T16000M management/web interface to the internet; restrict access to trusted internal networks only.
    • Place the device behind a VPN or firewall rule limiting inbound access to the administrative interface.
    • Monitor device logs for unexpected session or authentication activity.
    • Consider replacing or isolating the device if it cannot be taken offline from the public internet until a fix is available.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: ipTIME T16000M

References

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4

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6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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