CVE-2026-79673 — Ech0 before 4.4.3 Scope Bypass via profile:read Token

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HIGH

Ech0 before 4.4.3 Scope Bypass via profile:read Token

Published Aug 25, 2026

8.5

HIGH

CVSS 4.0

EPSS 0.43%

Description

Ech0 before 4.4.3 protects the PUT /user endpoint with the profile:read scope, a read-only scope, but allows write operations including password changes. An attacker with an admin's profile:read access token can change the admin's password and login to obtain an unrestricted session token that bypasses all scope enforcement.

Affected products

Vendor Lin-Snow Product Ech0 Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <4.4.3
- Version
  4.4.3
  Status
  unaffected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Lin-Snow

Ech0

unaffected

Version	Status	Constraints
0	affected	<4.4.3
4.4.3	unaffected	-

Ecosystem	Package	Introduced	Fixed
Go	github.com/lin-snow/ech0	0	not fixed

Remediation

No remediation recorded yet.

Metrics

0.43% 0.00427

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.00427

Score over time

Aug–Oct 2026

EPSS v5

Percentile over time

EPSS v5

Table of values (2 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	0.43% (0.00427)	34.72th	v5 (v2026.06.15)
Aug 26, 2026	0.24% (0.00245)	15.54th	v5 (v2026.06.15)

Weaknesses (1)

CWE-863

Incorrect Authorization

References (2)

https://github.com/lin-snow/Ech0/security/advisories/GHSA-hm2h-wwwh-g49x
vendor-advisory
https://www.vulncheck.com/advisories/ech0-before-scope-bypass-via-profile-read-token
third-party-advisory

Link	Providers	Tags
https://github.com/lin-snow/Ech0/security/advisories/GHSA-hm2h-wwwh-g49x		vendor-advisory
https://www.vulncheck.com/advisories/ech0-before-scope-bypass-via-profile-read-token		third-party-advisory