# CVE-2026-124014: Copeland XWEB EVO arbitrary file write

Source: https://junglewise.ai/threats/cve-2026-124014-xweb-evo-4-3-0-through-5-8-8-contains-an-unauthenticated  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-124014 · Severity: critical · CVSS 9.1 · Published 2026-11-12

XWEB EVO is a building control system used to manage HVAC and refrigeration equipment across facilities. Versions 4.3.0 through 5.8.8 contain an unauthenticated flaw that allows attackers to write arbitrary files to the system over the network without credentials. An attacker can modify critical configuration files or disable the system entirely, affecting building operations and potentially exposing environmental control to manipulation.

Technologies: [Copeland XWEB EVO](https://junglewise.ai/threats/technologies/xweb-evo). Vendors: [Copeland](https://junglewise.ai/threats/vendors/copeland).

## Quick answers

**Is CVE-2026-124014 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124014 being exploited in the wild.

**How severe is CVE-2026-124014?** Critical severity, with a CVSS score of 9.1, published 12 November 2026.

**Which products and versions are affected?** Copeland XWEB EVO 4.3.0 through 5.8.8.

**Is there a fix for CVE-2026-124014?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-124014 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-124014?** Check whether you run Copeland XWEB EVO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an unauthenticated arbitrary file write in config.lua endpoint. The action=set operation accepts POST requests without session validation and writes the raw, unvalidated request body to /etc/xwebconfig.json. An attacker on the network can tamper with configuration values (model, plugin fields) or trigger a SYSTEM_NOT_CONFIGURED state via action=get and action=set operations, resulting in configuration tampering and denial of service.

## Affected products

- Copeland XWEB EVO 4.3.0 through 5.8.8

## Timeline

- 2026-11-12: disclosed

## References

- [https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate](https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate)
- [https://webapps.copeland.com/dixell/Content/Pages/AdvertisingMaterials/ProductNews/XWEB%20EVO%20EoS%20-%20Product_Bulletin_March_2026.pdf](https://webapps.copeland.com/dixell/Content/Pages/AdvertisingMaterials/ProductNews/XWEB%20EVO%20EoS%20-%20Product_Bulletin_March_2026.pdf)

## Related threats

- [Copeland XWEB EVO authentication bypass in password reset](https://junglewise.ai/threats/cve-2026-124015-xweb-evo-5-6-2-through-5-8-8-contains-an-authentication-bypass)
- [Copeland XWEB EVO OS command injection in api.lua](https://junglewise.ai/threats/cve-2026-124013-xweb-evo-5-6-2-through-5-8-8-contains-an-authenticated-os)
- [Copeland XWEB EVO hardcoded credential authentication bypass](https://junglewise.ai/threats/cve-2026-124012-xweb-evo-5-6-2-through-5-8-8-contains-a-hardcoded-credential)
- [Copeland XWEB EVO information disclosure in sysinfo.lua](https://junglewise.ai/threats/cve-2026-124011-xweb-evo-5-6-2-through-5-8-8-contains-an-information-disclosure)
- [Copeland XWEB EVO command injection vulnerability](https://junglewise.ai/threats/cve-2026-124010-xweb-evo-before-5-6-2-contains-a-command-injection-vulnerability)