CVE intelligence and bounded remediation

CVE-2026-21718 — Copeland Xweb 300D Pro Firmware security vulnerability

Critical CVSS 10

An authentication bypass vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling any attackers to bypass the authentication requirement and achieve pre-authenticated code execution on the system.

Severity
Critical
CVSS
10 (3.1)
Published
2026-02-27
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-327

Affected products

  • copeland / xweb_300d_pro_firmware
  • copeland / xweb_500d_pro_firmware
  • copeland / xweb_500b_pro_firmware

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

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

Check exposure

  • Inventory affected algorithms, key uses, trust stores, certificate validation settings, random sources, and plaintext channels across clients and services.
  • Determine which secrets, identities, signatures, or data protections depend on the affected primitive or validation path.
  • Check debug, compatibility, fallback, and hostname or audience override settings in build and runtime configuration.

Remediate safely

  • Use a maintained platform cryptographic API with approved algorithms, modes, parameters, randomness, and full peer identity validation.
  • Remove insecure fallback and validation bypasses; separate keys by purpose and load them from managed secret storage.
  • Plan rotation or reissuance for affected keys, certificates, tokens, hashes, or ciphertext and document compatibility sequencing.

Authoritative sources

Complete CVE record and remediation plan

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