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CRITICAL

CVE-2026-49819

UpSnap - Unauthenticated Initial-Superuser Takeover Chains to Root RCE via wake_cmd

CVSS v3

9.8

CRITICAL

EPSS Score

1.1 %

exploit probability, as of 2026-09-27

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

UpSnap is a wake on lan web app. Versions 4.4.1 through 5.3.5 are vulnerable to a missing-authentication / privilege-escalation chain in `pb.HandlerInitSuperuser` (`backend/pb/handlers.go:249`), reachable as `POST /api/upsnap/init-superuser`. The vulnerable code lacks any authentication, setup token, IP allow-list, or rate limit and is gated only by a `totalSuperusers > 0` count check — a condition that is false on every fresh install — allowing an unauthenticated network-adjacent attacker to re

Technical details

Published
2026-08-13
Last Modified
2026-08-13

Frequently asked questions

What is CVE-2026-49819?

UpSnap is a wake on lan web app. Versions 4.4.1 through 5.3.5 are vulnerable to a missing-authentication / privilege-escalation chain in `pb.HandlerInitSuperuser` (`backend/pb/handlers.go:249`), reachable as `POST /api/upsnap/init-superuser`. The vulnerable code lacks any authentication, setup token, IP allow-list, or rate limit and is gated only by a `totalSuperusers > 0` count check — a condition that is false on every fresh install — allowing an unauthenticated network-adjacent attacker to re

Is CVE-2026-49819 actively exploited?

Active exploitation of CVE-2026-49819 has not been confirmed. Its EPSS score was 1.1% on 2026-09-27, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-49819?

CVE-2026-49819 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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