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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.

nebula-mesh 是一个自托管的 Slack Nebula mesh VPN 控制平面。在 0.3.8 版本之前，操作员会话令牌以明文形式存储在 表中（ 列为主键）。会话令牌是一个 32 字节的随机十六进制值，直接通过 Cookie 发送，有效期为 24 小时。任何能够读取数据库的人（通过备份、快照、文件复制或 SQL 级别的信息泄露）都能获取所有活动的会话令牌，并直接劫持操作员会话，无需进一步的身份验证。该问题已在 0.3.8 版本中修复。

CVSS 7.1 · High

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

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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