CVE-2026-79668 Ech0 before 4.7.3 Unauthenticated Like Endpoint Metric Inflation
Unauthenticated attackers can inflate engagement metrics on Ech0 by repeatedly calling the like endpoint without identity verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-79668?
CVE-2026-79668 is a medium-severity missing authorization vulnerability in lin-snow Ech0, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Ech0 before 4.7.3 contains an authentication bypass vulnerability in the PUT /api/echo/like/:id endpoint that allows unauthenticated attackers to increment engagement metrics without identity verification or rate limiting. Attackers can send repeated requests to arbitrarily inflate the fav_count field for any known echo identifier, compromising the integrity of engagement metrics and social ranking systems.
Weakness: CWE-306
Which versions are affected by CVE-2026-79668?
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 | 1.4.8-0.20260503040728-a7e8b8e84bd1 |
github.com/lin-snow/ech0 Go | All versions | 1.4.8-0.20260503040728-a7e8b8e84bd1 |
github.com/lin-snow/ech0 Go | All versions | 1.4.8-0.20260503040728-a7e8b8e84bd1 |
How do I fix CVE-2026-79668?
Upgrade github.com/lin-snow/ech0 to 1.4.8-0.20260503040728-a7e8b8e84bd1 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-79668 being exploited?
There is no known exploitation of CVE-2026-79668 in the wild and no public exploit code.
Sources
Also known as GHSA-7v7f-8gw6-2q2x, GHSA-rgj7-vg8v-j4wr, GO-2026-5623.