CVE-2026-49819 | CVSS: 9.8 | 严重级别: CRITICAL
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 register the initial superuser account, receive a long-lived JWT, and pivot to root remote code execut
参考链接:
• https://github.com/seriousm4x/UpSnap/releases/tag/5.4.0
• https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq
• https://github.com/seriousm4x/UpSnap/security/advisories/GHSA-w4jr-728f-5jhq
📌 数据来源: NVD 官方