CVE-2023-5933Public exploitNetwork attack vector

Arbitrary API PUT requests via name HTML injection

Published Jan 26, 2024 · Updated Apr 25, 2026

HTML injection in affected GitLab CE/EE releases allows remote authenticated users to issue arbitrary API PUT requests through a victim's session. The name sanitizer removes only complete tags, so an unterminated anchor survives and retains attacker-controlled class and href attributes after later sanitization. On a merge request page, the injected draft-toggle handler sends a PUT request to that href when the authenticated victim clicks the overlay, enabling actions within the victim's API permissions.

CVSS severity6.4
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in affected GitLab CE/EE releases allows remote authenticated users to issue arbitrary API PUT requests through a victim's session. The name sanitizer removes only complete tags, so an unterminated anchor survives and retains attacker-controlled class and href attributes after later sanitization. On a merge request page, the injected draft-toggle handler sends a PUT request to that href when the authenticated victim clicks the overlay, enabling actions within the victim's API permissions.

The record

CVE
CVE-2023-5933
Published
Jan 26, 2024
Updated
Apr 25, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-80, CWE-79, T1204
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 2026Record 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=13.7 <16.6.6
  2. Affected versionversion=16.7 <16.7.4
  3. Affected versionversion=16.8 <16.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=13.7 <16.6.6; version=16.7 <16.7.4; version=16.8 <16.8.1

Published CVSS scores

6.4GitLab Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204User Execution

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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