Is CVE-2026-79661 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-79661 being exploited in the wild.

How severe is CVE-2026-79661?

Medium severity, with a CVSS score of 6.5, published 25 August 2026.

Which products and versions are affected?

github.com/lin-snow/ech0 (Go) SEMVER:introduced=0,fixed=1.4.8-0.20260503035905-cecc2c19b590; Lin-Snow Ech0 through 4.5.6.

Is there a fix for CVE-2026-79661?

Yes. github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260503035905-cecc2c19b590 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-79661 attacked?

It is attacked over the network.

Am I affected by CVE-2026-79661?

Check whether you run github.com/lin-snow/ech0 (Go) or Lin-Snow Ech0 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-79661: Ech0 unauthenticated fav_count modification

CVE-2026-79661 · Severity: medium · CVSS 6.5 · Published 2026-08-25

Ech0 is a social media feed application. An unprotected endpoint allows anyone on the network to artificially boost the popularity counter of any post without authentication or rate limits. Attackers can damage platform integrity by manipulating trending rankings and overwhelming the database with repeated write requests.

Technologies: github.com/lin-snow/ech0 (Go), Lin-Snow Ech0. Vendors: Go, Lin-Snow.

Quick answers

Is CVE-2026-79661 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-79661 being exploited in the wild.
How severe is CVE-2026-79661?: Medium severity, with a CVSS score of 6.5, published 25 August 2026.
Which products and versions are affected?: github.com/lin-snow/ech0 (Go) SEMVER:introduced=0,fixed=1.4.8-0.20260503035905-cecc2c19b590; Lin-Snow Ech0 through 4.5.6.
Is there a fix for CVE-2026-79661?: Yes. github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260503035905-cecc2c19b590 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-79661 attacked?: It is attacked over the network.
Am I affected by CVE-2026-79661?: Check whether you run github.com/lin-snow/ech0 (Go) or Lin-Snow Ech0 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260503035905-cecc2c19b590 or later
```
go get github.com/lin-snow/ech0@v1.4.8-0.20260503035905-cecc2c19b590
```

Technical details

The PUT /api/echo/like/:id endpoint is registered on the public router group without JWT authentication or rate limiting. The vulnerable LikeEcho handler in internal/repository/echo/echo.go:270 performs no visibility checks and accepts repeated increment requests from the same IP without deduplication. Attackers can harvest post UUIDs from the public GET /api/echo/page feed or via other channels (logs, referer headers, shared drafts) and craft repeated PUT requests to inflate fav_count on any echo, including private echoes. Each request triggers a database UPDATE transaction plus four cache key invalidations, amplifying load on storage and caching layers. The issue is fixed in version 4.7.3 by moving the route to AuthRouterGroup, adding per-user deduplication, and implementing rate limiting middleware.

Affected products

lin-snow Ech0 through 4.5.6

Identifiers

CVE-2026-79661
GHSA-pj6q-4vq4-r8cg
GO-2026-5541

Timeline

2026-05-03: disclosed: GitHub Security Advisory published
2026-04: patched: Fixed in version 4.7.3
2026-08-25: advisory: CVE-2026-79661 published on NVD

References

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