Quick answers
- Is CVE-2026-107243 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-107243 being exploited in the wild.
- How severe is CVE-2026-107243?
- High severity, with a CVSS score of 7.6, published 10 November 2026.
- Which products and versions are affected?
- Versa Networks VOS.
- Is there a fix for CVE-2026-107243?
- No fixed version is recorded yet. Disable the Node.js web service after initial provisioning is complete, per Versa's security hardening guide for Hubs, Branches, and Controllers. 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-2026-107243 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-107243?
- Check whether you run Versa-Networks VOS. 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.
How to fix
Disable the Node.js web service after initial provisioning is complete, per Versa's security hardening guide for Hubs, Branches, and Controllers.
Technical details
The express-session middleware in the Node.js service uses a hardcoded, globally-shared secret to sign session cookies via HMAC-SHA256. An attacker who obtains any valid session ID can compute the correct signature and forge cookies accepted by any VOS appliance. The vulnerability requires network access to the Node.js web service port but no prior authentication; disabling the service post-provisioning eliminates the risk.
Affected products
- Versa Networks VOS
Timeline
- 2026-11-10: disclosed