CVE-2026-79661 — Ech0 before 4.7.3 Unauthenticated fav_count Modification
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 …
Published: 2026-08-25 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7