CVE-2022-23527Network attack vector

User redirection via tab-prefixed logout URL

Published Dec 14, 2022 · Updated Apr 18, 2025

Open redirect in OpenIDC mod_auth_openidc before 2.4.12.2 allows remote attackers to redirect users via a crafted logout URL. The oidc_validate_redirect_url() function fails to reject redirect targets beginning with a slash followed by a tab, so a logout parameter escapes the intended site boundary. Exploitation requires a user to follow the crafted URL; the redirect can send that user to an attacker-controlled site but does not directly disclose server data.

CVSS severity4.7
Medium
EPSS probability0.91%
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 OpenIDC mod_auth_openidc before 2.4.12.2 allows remote attackers to redirect users via a crafted logout URL. The oidc_validate_redirect_url() function fails to reject redirect targets beginning with a slash followed by a tab, so a logout parameter escapes the intended site boundary. Exploitation requires a user to follow the crafted URL; the redirect can send that user to an attacker-controlled site but does not directly disclose server data.

The record

CVE
CVE-2022-23527
Published
Dec 14, 2022
Updated
Apr 18, 2025
Vendor
OpenIDC
Product
mod_auth_openidc
Classifications
CWE-601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 18, 2025Record 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=< 2.4.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenIDC · mod_auth_openidcversion=< 2.4.12.2

Published CVSS scores

4.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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