CVE-2026-41479Public exploitNetwork attack vector

Unauthenticated open redirect via unvalidated redirect URI

Published Jun 22, 2026 · Updated Jun 22, 2026

Open redirect in Authlib before 1.6.10 and in 1.7.0 allows remote attackers to redirect users via a crafted authorization request. AuthorizationServer.get_authorization_grant copies the raw redirect_uri into an UnsupportedResponseTypeError before client lookup, and OAuth2Error.call emits it as a 302 Location without validation. A user must visit the crafted authorization URL, after which the trusted endpoint redirects the browser to an attacker-controlled site suitable for phishing or credential theft.

CVSS severity5.4
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Authlib before 1.6.10 and in 1.7.0 allows remote attackers to redirect users via a crafted authorization request. AuthorizationServer.get_authorization_grant copies the raw redirect_uri into an UnsupportedResponseTypeError before client lookup, and OAuth2Error.call emits it as a 302 Location without validation. A user must visit the crafted authorization URL, after which the trusted endpoint redirects the browser to an attacker-controlled site suitable for phishing or credential theft.

The record

CVE
CVE-2026-41479
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Authlib
Product
Authlib
Classifications
CWE-601, CAPEC-178, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 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=< 1.6.10
  2. Affected versionversion== 1.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Authlib · Authlibversion=< 1.6.10; version== 1.7.0

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1204.001Malicious Link

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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