CVE-2023-0155Public exploitNetwork attack vector

Authenticated open redirect via prefix-matched iframe source

Published May 3, 2023 · Updated Feb 12, 2025

Open redirect in GitLab CE/EE before 15.8.5, 15.9.4, and 15.10.1 allows remote authenticated users to redirect viewers via Markdown. InlineObservabilityFilter matches link targets by string prefix instead of validating the parsed origin, causing lookalike observe.gitlab.com hosts to become unsandboxed iframe sources. An attacker must publish crafted Markdown and a viewer must open the affected page; the framed page can navigate the top window or repeatedly make that page inaccessible.

CVSS severity5.4
Medium
EPSS probability0.77%
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 GitLab CE/EE before 15.8.5, 15.9.4, and 15.10.1 allows remote authenticated users to redirect viewers via Markdown. InlineObservabilityFilter matches link targets by string prefix instead of validating the parsed origin, causing lookalike observe.gitlab.com hosts to become unsandboxed iframe sources. An attacker must publish crafted Markdown and a viewer must open the affected page; the framed page can navigate the top window or repeatedly make that page inaccessible.

The record

CVE
CVE-2023-0155
Published
May 3, 2023
Updated
Feb 12, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>=15.7, <15.8.5
  2. Affected versionversion=>=15.8, <15.9.4
  3. Affected versionversion=>=15.9, <15.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=15.7, <15.8.5; version=>=15.8, <15.9.4; version=>=15.9, <15.10.1

Published CVSS scores

5.4GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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