CVE-2026-21718

CRITICAL 10.0

Copeland XWEB and XWEB Pro Use of a Broken or Risky Cryptographic Algorithm

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-327
Vendor	copeland
Product	copeland xweb 300d pro
Published	Feb 27, 2026
Last Updated	Mar 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Copeland / Copeland XWEB 300D PRO

0 ≤ 1.12.1

Copeland / Copeland XWEB 500D PRO

0 ≤ 1.12.1

Copeland / Copeland XWEB 500B PRO

0 ≤ 1.12.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

webapps.copeland.com: https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.json

Credits

Amir Zaltzman and Noam Moshe of Claroty Team82 reported this vulnerability to CISA.