CVE-2026-21718
Critical
Description
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.
SeverityCritical
CVSS10.0
Exploit probability—
ProductCopeland Xweb 300d Pro Firmware
PublishedFeb 27, 2026
First seenFeb 27, 2026
Weakness typeCWE-327CWE-327
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| copeland xweb_300d_pro_firmware | v ≤ 1.12.1 | — |
| copeland xweb_500d_pro_firmware | v ≤ 1.12.1 | — |
| copeland xweb_500b_pro_firmware | v ≤ 1.12.1 | — |
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