CVE-2026-79662Public exploitNetwork attack vector

Account takeover via partial redirect URI matching

Published Aug 25, 2026 · Updated Aug 25, 2026

OAuth redirect validation in Ech0 before 4.7.3 allows remote attackers to steal user tokens through a crafted login link. parseAndValidateClientRedirect compares only the scheme and host, then redirects to an attacker-chosen path with a one-time code. Exploitation requires opt-in OAuth, an allowlisted host that leaks URLs, and victim interaction; a leaked code yields access and refresh tokens.

CVSS severity8.0
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OAuth redirect validation in Ech0 before 4.7.3 allows remote attackers to steal user tokens through a crafted login link. parseAndValidateClientRedirect compares only the scheme and host, then redirects to an attacker-chosen path with a one-time code. Exploitation requires opt-in OAuth, an allowlisted host that leaks URLs, and victim interaction; a leaked code yields access and refresh tokens.

The record

CVE
CVE-2026-79662
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
lin-snow
Product
Ech0
Classifications
CWE-1173, CWE-601, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

lin-snow · Ech0version=0 <4.7.3

Published CVSS scores

8.0GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1173Improper Use of Validation Framework
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1528Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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