What is CVE-2023-0155?

CVE-2023-0155 is a medium-severity vulnerability in GitLab, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2023-05-03.

How severe is CVE-2023-0155?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Open Redirect in GitLab

CVE-2023-0155

An issue has been discovered in GitLab CE/EE affecting all versions before 15.8.5, 15.9.4, 15.10.1. Open redirects was possible due to framing arbitrary content on any page allowing user controlled markdown

Vulnerability class: Open Redirect

Published 2023-05-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.008 (53.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

GitLab — versions >=15.7, <15.8.5, >=15.8, <15.9.4, >=15.9, <15.10.1

Weakness classification (CWE)

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

References

gitlab.com/gitlab-org/gitlab/-/issues/387638 (Exploit, Third Party Advisory)
hackerone.com/reports/1817250 (Permissions Required)
gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0155.json (Third Party Advisory)

Frequently asked questions

What is CVE-2023-0155?: CVE-2023-0155 is a medium-severity vulnerability in GitLab, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2023-05-03.
How severe is CVE-2023-0155?: Medium severity. CVSS v3 base score is 5.4 out of 10.