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CVE-2026-21718

CRITICAL CVSS 3.1: 9.8 EPSS 0.05%
Updated Feb 27, 2026
Copeland
Parameter Value
CVSS 9.8 (CRITICAL)
Affected Versions before 1.12.1
Type CWE-327 (Weak Crypto Algorithm)
Vendor Copeland
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 6

Configuration From (including) Up to (excluding)
Copeland Xweb_300d_Pro_Firmware
cpe:2.3:o:copeland:xweb_300d_pro_firmware:*:*:*:*:*:*:*:*
<= 1.12.1
Copeland Xweb_300d_Pro
cpe:2.3:h:copeland:xweb_300d_pro:-:*:*:*:*:*:*:*
Copeland Xweb_500d_Pro_Firmware
cpe:2.3:o:copeland:xweb_500d_pro_firmware:*:*:*:*:*:*:*:*
<= 1.12.1
Copeland Xweb_500d_Pro
cpe:2.3:h:copeland:xweb_500d_pro:-:*:*:*:*:*:*:*
Copeland Xweb_500b_Pro_Firmware
cpe:2.3:o:copeland:xweb_500b_pro_firmware:*:*:*:*:*:*:*:*
<= 1.12.1
Copeland Xweb_500b_Pro
cpe:2.3:h:copeland:xweb_500b_pro:-:*:*:*:*:*:*:*