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CVE-2026-53603— nebula-mesh: Operator session tokens stored in plaintext in the database

Quick assessment

Affected
forgekeep nebula-mesh
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.

Forgekeep nebula-mesh是Forgekeep团队的一款构建安全虚拟专用网络的组网工具。 Forgekeep nebula-mesh 0.3.8之前版本存在安全漏洞，该漏洞源于操作员会话令牌以明文形式存储在operator_sessions表中，可能导致能够读取数据库的攻击者获取所有活动会话令牌并无进一步身份验证直接劫持操作员会话。

CVSS 7.1 · High EPSS 0.35% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
forgekeep nebula-mesh < 0.3.8 affected
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I. Basic Information for CVE-2026-53603

Vulnerability Information
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Vulnerability Title
nebula-mesh: Operator session tokens stored in plaintext in the database
Source: CVE Program / CVE List V5
Vulnerability Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, Operator session tokens are stored in plaintext in the operator_sessions table (the token column is the PRIMARY KEY). The session token is a 32-byte random hex value sent directly in a cookie and valid for 24 hours. Anyone who can read the database (backup, snapshot, file copy, or SQL-level disclosure) obtains every active session token and can hijack operator sessions directly, with no further authentication. This issue has been patched in version 0.3.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文存储
Source: CVE Program / CVE List V5
Vulnerability Title
Forgekeep nebula-mesh 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Forgekeep nebula-mesh是Forgekeep团队的一款构建安全虚拟专用网络的组网工具。 Forgekeep nebula-mesh 0.3.8之前版本存在安全漏洞，该漏洞源于操作员会话令牌以明文形式存储在operator_sessions表中，可能导致能够读取数据库的攻击者获取所有活动会话令牌并无进一步身份验证直接劫持操作员会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
forgekeep nebula-mesh < 0.3.8 -

II. Public POCs for CVE-2026-53603

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III. Intelligence Information for CVE-2026-53603

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Patches & Fixes for CVE-2026-53603 (1)

Vendor Advisories for CVE-2026-53603 (1)

Vendor Pages for CVE-2026-53603 (1)

Same Patch Batch · forgekeep · 2026-09-04 · 7 CVEs total

CVE-2026-61699 8.1 HIGH nebula-mesh: Certificate revocation is never enforced at the mesh
CVE-2026-63464 7.7 HIGH Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_priva
CVE-2026-53604 7.1 HIGH nebula-mesh: CA private key not zeroized on web mobile-bundle error paths
CVE-2026-53602 6.9 MEDIUM nebula-mesh - Host revocation is not durable: blocked/offboarded hosts can regain a valid
CVE-2026-55513 5.4 MEDIUM nebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hou
CVE-2026-55512 5.3 MEDIUM nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entri

IV. Related Vulnerabilities

Same product: nebula-mesh
Same vendor: forgekeep
Same weakness: CWE-312

V. Comments for CVE-2026-53603

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