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CVE-2026-21718

Copeland Xweb 300d Pro Firmware authentication bypass

10.0 CRITICALEPSS 0.44%
  1. Published27 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Copeland Xweb 300d Pro Firmware≤ 1.12.1
Copeland Xweb 500b Pro Firmware≤ 1.12.1
Copeland Xweb 500d Pro Firmware≤ 1.12.1

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-21718 being actively exploited?

CVE-2026-21718 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.44%.

How severe is CVE-2026-21718?

CVE-2026-21718 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.44% probability of exploitation.

Which products are affected by CVE-2026-21718?

Affected products include Copeland Xweb 300d Pro Firmware, Copeland Xweb 500b Pro Firmware, Copeland Xweb 500d Pro Firmware.

How do I fix CVE-2026-21718?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-21718 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.