CVE-2026-21718

Name: CVE-2026-21718
Creator: NVD / NIST
Published: 2026-02-27T01:16:18.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.43%

Last modified Jun 17, 2026

CVE-2026-21718 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.43%

34.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Copeland	Xweb 300d Pro Firmware	<= 1.12.1
Copeland	Xweb 500d Pro Firmware	<= 1.12.1
Copeland	Xweb 500b Pro Firmware	<= 1.12.1

References

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.jsonThird Party Advisory
https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdateProduct
https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10Third Party Advisory, US Government Resource

Timeline

Published: Feb 27, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21718?

How severe is CVE-2026-21718?

CVE-2026-21718 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21718?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21718?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST