Private reference-title disclosure via unredacted Markdown expansion
Published Jun 20, 2025 · Updated Jun 20, 2025
Missing authorization in GitLab EE allows remote authenticated users to read private reference titles through Service Desk email replies. The custom thank_you.md renderer substitutes an email body into ISSUE_DESCRIPTION and expands GitLab Flavored Markdown references without redacting titles from inaccessible private objects. Exploitation requires project access, an enabled Service Desk custom reply template, and a crafted inbound email; the exposure is limited to object titles.
Summary
What happened
Missing authorization in GitLab EE allows remote authenticated users to read private reference titles through Service Desk email replies. The custom thank_you.md renderer substitutes an email body into ISSUE_DESCRIPTION and expands GitLab Flavored Markdown references without redacting titles from inaccessible private objects. Exploitation requires project access, an enabled Service Desk custom reply template, and a crafted inbound email; the exposure is limited to object titles.
The record
- CVE
- CVE-2023-5600
- Published
- Jun 20, 2025
- Updated
- Jun 20, 2025
- Vendor
- GitLab
- Product
- GitLab
- Classifications
- CWE-862, T1213
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 20, 2025CVE publishedPublication date reported by the CVE source.
- Jun 20, 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.
- Affected versionversion=16.0 <16.3.6
- Affected versionversion=16.4 <16.4.2
- Affected versionversion=16.5 <16.5.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- Service Desk private-reference title disclosure reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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