Answer in brief
CVE-2026-79670 records a Medium severity (CVSS 4.8) vulnerability in Ech0 before 4.4.3 Stored XSS via SVG Upload. The current sources do not mark it as known exploited. The current feed maps lin-snow/Ech0 (generic), github.com/lin-snow/ech0 (go), github.com/lin-snow/ech0 (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps lin-snow/Ech0 (generic), github.com/lin-snow/ech0 (go), github.com/lin-snow/ech0 (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| lin-snow/Ech0generic | >=0 <4.4.3 | 4.4.3 |
| github.com/lin-snow/ech0go | >=0 <4.4.3 | 4.4.3 |
| github.com/lin-snow/ech0go | >=0 | Not reported |
Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 25, 2026
Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.
Quoted source text, attributed separately from HOL analysis.