CVE-2026-79666 Ech0 before 4.4.3 Missing Authorization via dashboard log endpoints
Authenticated users can access sensitive system logs via dashboard endpoints due to missing administrator authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-79666?
CVE-2026-79666 is a high-severity missing authorization vulnerability in lin-snow Ech0, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Ech0 before 4.4.3 fails to enforce administrator authorization on dashboard log endpoints, allowing any authenticated user to access system logs. Attackers with valid user sessions can query GET /api/system/logs and subscribe to SSE and WebSocket log streams to retrieve sensitive operational data including file paths, stack traces, and internal URLs.
Weakness: CWE-862
Which versions are affected by CVE-2026-79666?
3 open source packages ship an affected version, including github.com/lin-snow/ech0.
| Package | Affected | Fixed in |
|---|---|---|
github.com/lin-snow/ech0 Go | All versions | None |
github.com/lin-snow/ech0 Go | All versions | 4.3.5 |
github.com/lin-snow/ech0 Go | All versions | 4.3.5 |
How do I fix CVE-2026-79666?
Upgrade github.com/lin-snow/ech0 to 4.3.5 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-79666 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79666 exists.
Sources
Also known as GHSA-7j6f-2mq2-g5vq, GHSA-cp79-9mwr-wr49, GO-2026-5328.