CVE intelligence and bounded remediation

CVE-2023-3526 — Phoenixcontact Cloud Client 1101T-Tx Firmware security vulnerability

Critical CVSS 9.6

In PHOENIX CONTACTs TC ROUTER and TC CLOUD CLIENT in versions prior to 2.07.2 as well as CLOUD CLIENT 1101T-TX/TX prior to 2.06.10 an unauthenticated remote attacker could use a reflective XSS within the license viewer page of the devices in order to execute code in the context of the user's browser.

Severity
Critical
CVSS
9.6 (3.1)
Published
2023-08-08
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-79

Affected products

  • phoenixcontact / cloud_client_1101t-tx_firmware
  • phoenixcontact / tc_cloud_client_1002-4g_att_firmware
  • phoenixcontact / tc_cloud_client_1002-4g_firmware
  • phoenixcontact / tc_cloud_client_1002-4g_vzw_firmware
  • phoenixcontact / tc_router_3002t-4g_att_firmware
  • phoenixcontact / tc_router_3002t-4g_firmware

Showing 6 representative product identities from 7 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Cross-site scripting and unsafe browser output

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace reflected, stored, and DOM-derived untrusted values into HTML, attributes, URLs, styles, scripts, and client-side template sinks.
  • Identify affected origins, authenticated user roles, sensitive browser capabilities, and where content is shared across tenants.
  • Review framework escaping, rich-text sanitization, legacy templates, and client-side rendering paths.

Remediate safely

  • Use context-aware framework output encoding and safe DOM APIs; keep untrusted data out of executable contexts.
  • Sanitize intentionally supported markup with a maintained allowlist policy and validate URLs and attributes separately.
  • Update affected rendering components and add tests for every output context using inert sentinel markup.

Authoritative sources

Complete CVE record and remediation plan

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