---
id: "CVE-2026-107242"
page: "https://infrastack.ai/live/CVE-2026-107242"
kind: "vulnerability"
aliases: ["CVE-2026-107242"]
title: "Versa VOS: predictable session IDs in provisioning web service allow session hijack"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "network-appliance", "versa-flexvnf", "versa-vos"]
not_affected_if: ["provisioning-complete", "service-disabled"]
published_at: "2026-11-10T01:17:12+00:00"
first_seen_at: "2026-11-10T01:26:36+00:00"
updated_at: "2026-11-10T01:30:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107242", "first_seen_at": "2026-11-10T01:26:36+00:00"}]
exploit_sources: []
---

# Versa VOS: predictable session IDs in provisioning web service allow session hijack

Link for people: https://infrastack.ai/live/CVE-2026-107242 (this .md is for agents)

The Node.js web service on Versa VOS (formerly FlexVNF), used for URL-based zero touch provisioning, creates session IDs with UUIDv1, which are derived from time and MAC address and can be predicted. An attacker who predicts a user's session ID could hijack that session.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the Node.js web service used for zero touch provisioning is still enabled on each VOS appliance
- Confirm the device has finished initial provisioning, since the service is not needed afterward

## Timeline

- 2026-11-10T01:26:36+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107242

## From the sources

The Node.js web service on VOS (previously Versa FlexVNF) is used for URL-based Zero Touch Provisioning (ZTP) of the VOS appliance and is not required after provisioning is complete. This service generates session identifiers using UUID version 1 (UUIDv1), which is derived from the system’s date and time and its MAC address. As a result, successive identifiers differ only slightly and can be predicted. An attacker who can predict a user’s session ID could hijack that user’s session. 

Versa’s security hardening guide for Hubs, Branches, and Controllers recommends disabling the Node.js web service after the initial provisioning of the VOS device. This vulnerability is not exploitable on VOS devices where the Node.js web service has been disabled.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_