How to Fix CVE-2026-20764: Copeland XWEB 300D PRO (Bundle Sibling)
By Sai Kiran Pandrala. Last verified: 2026-05-25.
CVE-2026-20764 is a sibling vulnerability in the same vendor advisory as CVE-2026-20742. Apply the same patched build and you close both. The technical detail below is what differs.
| Severity | 8 (High) |
|---|---|
| Actively exploited? | No public listing in CISA KEV |
| Affected | Copeland XWEB 300D PRO 0 to <=1.12.1; Copeland XWEB 500D PRO 0 to <=1.12.1; Copeland XWEB 500B PRO 0 to <=1.12.1 |
| Fixed in | Same patched build as CVE-2026-20742 |
| Type (CWE) | CWE-78 |
What's different about CVE-2026-20764?
An OS command injection
vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an
authenticated attacker to achieve remote code execution on the system by
providing malicious input via the device hostname configuration which
is later processed during system setup, resulting in remote code
execution.
How to fix CVE-2026-20764
Apply the patched build per the primary write-up: How to Fix CVE-2026-20742. All commands, verification steps, and rollback notes for Copeland XWEB 300D PRO are listed there.
Frequently asked questions
Does the CVE-2026-20742 patch close CVE-2026-20764?
Yes. Both CVEs are addressed by the same vendor patch. Applying the patched build closes the full bundle.
Is CVE-2026-20764 listed in CISA KEV?
No public KEV listing at the time of this writing.
Where is the official advisory?
See https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate
References
- Official vendor advisory: https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20764
- CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- Primary: How to Fix CVE-2026-20742
*Written by Sai Kiran Pandrala. Part of the Copeland XWEB 300D PRO bundle. Full procedure at how-to-fix-cve-2026-20742.*