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CVE-2026-107243

Quick assessment

Affected
Versa VOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

VOS（原 Versa FlexVNF）上的 Node.js Web 服务用于基于 URL 的 VOS 设备零接触配置（ZTP），在配置完成后该服务已不再需要。server.js 中的 express-session 中间件配置了一个硬编码的密钥，该密钥在所有 VOS 设备上均相同，并用于对会话 Cookie 进行签名。任何攻击者若从任意来源获取到有效的会话 ID，即可计算出正确的 HMAC-SHA256 签名，从而伪造出服务器视为合法的会话 Cookie。由于该密钥在所有 VOS 设备间共享，因此伪造的 Cook

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-107243

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Versa VOS 21.1.1 ~ 21.2.3 -

II. Public POCs for CVE-2026-107243

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III. Intelligence Information for CVE-2026-107243

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Other References for CVE-2026-107243 (1)

Same Patch Batch · Versa · 2026-11-10 · 6 CVEs total

CVE-2026-107244 VOS Node.js 服务认证绕过漏洞
CVE-2026-107241 VOS Node.js 服务默认凭据漏洞
CVE-2026-107245 CVE-2026-107245
CVE-2026-107240 Versa VOS 任意版本 Node.js 远程命令执行漏洞
CVE-2026-107242 VOS Node.js 会话劫持漏洞

IV. Related Vulnerabilities

Same product: VOS
Same vendor: Versa
Same weakness: CWE-798