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No exploitation reportedAwaiting NVD analysis

CVE-2026-107243

No exploitation reported by the sources we read.

  • Published2026-11-10
  • WeaknessCWE-798

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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 express-session middleware in server.js is configured with a hardcoded secret that is identical across all VOS appliances and is used to sign session cookies. An attacker who obtains a valid session ID from any source can compute the correct HMAC-SHA256 signature and forge a session cookie that the server accepts as legitimate. Because the secret is shared across all VOS appliances, a forged cookie is accepted by any VOS appliance in the deployment.  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.

Timeline

dates in UTC
  1. 2026-11-1000:32CVE publishedCNA

Versions per branch

Products declared by the CNA

As hackerone, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Versa VOS
    Affected
    • ≥ 21.1.1, ≤ 21.2.3no fix statedsemver
    • ≥ 22.1.2, < July 2, 2026fixed in July 2, 2026semver
    • ≥ 22.1.3, < July 2, 2026fixed in July 2, 2026semver
    • ≥ 22.1.4, < July 2, 2026fixed in July 2, 2026semver
    • ≥ 23.1.2, < Aug 3, 2026fixed in Aug 3, 2026semver

    Not affected ≥ 22.1.2 July-2-2026-Hotfix, < 22.1.2 July-2-2026-Hotfix · ≥ 22.1.3 July-2-2026-Hotfix, < 22.1.3 July-2-2026-Hotfix · ≥ 22.1.4 July-2-2026-Hotfix, < 22.1.4 July-2-2026-Hotfix

    1 more version line in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-10

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-107243 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-10
  • CNACVSS 3.07.62026-11-10
  • CNAweakness (CWE)CWE-7982026-11-10

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Published
2026-11-10

Frequently asked questions

What is CVE-2026-107243?

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 express-session middleware in server.js is configured with a hardcoded secret that is identical across all VOS appliances and is used to sign session cookies. An attacker who obtains a valid session ID from any source can compute the correct HMAC-SHA256 signature and forge a session cookie that the server accepts as legitimate. Because the secret is shared across all VOS appliances, a forged cookie is accepted by any VOS appliance in the deployment.  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.

Is CVE-2026-107243 actively exploited?

Active exploitation of CVE-2026-107243 has not been confirmed.

What is the CVSS score for CVE-2026-107243?

CVE-2026-107243 has a CVSS v3 base score of 7.6 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H.

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