CVE-2023-0042Public exploitNetwork attack vector

Token disclosure via arbitrary-protocol authentication redirect

Published Jan 12, 2023 · Updated Apr 8, 2025

Open redirect in affected GitLab Pages 11.4, 15.6, and 15.7 releases allows remote attackers to expose tokens through crafted links. The Pages authentication endpoint accepts the domain parameter as a redirect target without restricting its URI scheme to HTTP or HTTPS. No attacker authentication is required; exposure requires a user to follow the link and a custom protocol handler to receive the redirect.

CVSS severity6.1
Medium
EPSS probability0.40%
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 affected GitLab Pages 11.4, 15.6, and 15.7 releases allows remote attackers to expose tokens through crafted links. The Pages authentication endpoint accepts the domain parameter as a redirect target without restricting its URI scheme to HTTP or HTTPS. No attacker authentication is required; exposure requires a user to follow the link and a custom protocol handler to receive the redirect.

The record

CVE
CVE-2023-0042
Published
Jan 12, 2023
Updated
Apr 8, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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=>=11.4, <15.5.7
  2. Affected versionversion=>=15.6, <15.6.4
  3. Affected versionversion=>=15.7, <15.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=>=11.4, <15.5.7; version=>=15.6, <15.6.4; version=>=15.7, <15.7.2

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1GitLab Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/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')
T1204.001User Execution: Malicious 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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