# 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.

- **Severity:** High 7.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-7j6f-2mq2-g5vq, GHSA-cp79-9mwr-wr49, GO-2026-5328

## 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 (Missing Authorization)

## Which versions are affected by CVE-2026-79666?

3 open source packages ship an affected version, including github.com/lin-snow/ech0.


| Package | Ecosystem | 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.

## Is CVE-2026-79666 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79666 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-79666 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79666 exists.

Affected packages and fixed versions:
- github.com/lin-snow/ech0 (Go): affected all versions; no fix listed
- github.com/lin-snow/ech0 (Go): affected all versions; fixed in 4.3.5
- github.com/lin-snow/ech0 (Go): affected all versions; fixed in 4.3.5

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-79666/ (Markdown: https://insights.sbomify.com/CVE-2026-79666/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-79666
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-79666
- OSV: https://osv.dev/vulnerability/CVE-2026-79666

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-79666/
Summaries are generated and may contain mistakes; the official description above is the record.