Unrated

nebula-mesh Web UI host creation enrollment token TTL bypass

IdentifiersCVE-2026-55513CWE-863

CVE-2026-55513 is an authorization and policy-enforcement flaw in nebula-mesh affecting the Web UI host-creation workflow. When a host is created through the Web UI, the application does not honor configured enrollment token lifetime settings and instead issues a bearer enrollment token with an effective lifetime of approximately 24 hours. This behavior diverges from the API path, which correctly applies the configured TTL resolution logic, including server-wide and per-network enrollment_token_ttl values. As a result, the Web UI path bypasses intended administrative restrictions on token validity and weakens controls designed to limit the exposure window of enrollment credentials.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an authenticated operator with permission to create hosts through the Web UI to mint enrollment tokens that remain valid significantly longer than intended by policy. If such a token is exposed, copied, logged, or otherwise obtained by an unauthorized party, it can be used to enroll the pending host and retrieve its Nebula certificate and configuration material. This undermines confidentiality and integrity assumptions tied to short-lived enrollment tokens and increases the window for unauthorized host enrollment.

Mitigation

If you can’t patch tonight, do this now.

Until patched, do not rely on the Web UI host-creation workflow in environments where short enrollment token lifetimes are a security requirement. Prefer API-based host creation and token regeneration paths that enforce the configured TTL policy. Limit Web UI host-creation privileges to trusted operators only, and monitor, revoke, or rotate enrollment tokens generated through the Web UI as appropriate.

Remediation

Patch, then assume compromise.

Upgrade nebula-mesh to version 0.5.0 or later. The vulnerable Web UI host-creation path should be corrected to use the same TTL resolution logic as the API path, or the TTL resolver should be centralized in a shared component consumed by both interfaces. Regression testing should verify that Web UI host creation honors configured server-wide and per-network enrollment_token_ttl values.

PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

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0 SOURCESView more in app

No public activity observed for this vulnerability.

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Exposure mapping

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Associated malware

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Detection signatures

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Social activity