EUVD-2026-65453
GHSA-7xcp-744q-324g
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible with no authentication or user interaction; scope unchanged; only limited integrity (fav_count inflation) and availability (DB/cache amplification) impact apply, with no confidentiality loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Unauthenticated remote attackers can increment the fav_count of any echo - including private ones - in Ech0 through 4.5.6 by issuing repeated PUT /api/echo/like/:id requests with no authentication, rate limiting, or deduplication. Each request triggers a database write and four-key cache invalidation, enabling both persistent metric corruption and amplified load against the database and cache layers. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable condition exists in the default installation of all Ech0 versions through 4.5.6: the PUT /api/echo/like/:id route is registered on `PublicRouterGroup` at `internal/router/echo.go:12` without JWT middleware, rate limiting, or deduplication - this is not a misconfiguration but the default shipped state. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms fully unauthenticated remote exploitation at zero attack complexity, establishing maximum accessibility. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker queries the public GET /api/echo/page feed to harvest valid echo UUIDs, then scripts repeated PUT /api/echo/like/:id calls against any target echo - including private ones - with no credentials or session token. Each iteration unconditionally increments the fav_count counter and flushes four cache keys; a tight Python loop (as demonstrated in the GHSA proof-of-concept) can sustain this indefinitely, inflating popularity metrics and amplifying write load on the database and cache until performance degrades. |
| Remediation | Upgrade Ech0 to version 4.7.3 or later, which resolves this vulnerability per the GHSA advisory (https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg) and upstream patch commit cecc2c19b590df85d79ea98457faa143130cd620. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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