CVE-2026-79661
6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Summary
Ech0 through 4.5.6 registers the PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Unauthenticated attackers can increment the fav_count counter of any echo (including private echoes) by supplying its UUID, which can be harvested from the public GET /api/echo/page feed. Repeated requests are accepted without deduplication, each triggering a database write and a four-key cache invalidation, allowing attackers to inflate popularity metrics and amplify load on the database and cache. Fixed in 4.7.3.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| lin-snow | Ech0 | 0 < 4.7.3 | affected |
| lin-snow | Ech0 | 4.7.3 | unaffected |
Weaknesses
- CWE-770: Allocation of Resources Without Limits or Throttling
References
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg
- https://www.vulncheck.com/advisories/ech0-before-unauthenticated-fav-count-modification
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