CVE-2023-6033Network attack vector

Browser-context code execution via unsanitized Jira Markdown

Published Dec 1, 2023 · Updated Nov 20, 2025

Stored XSS in GitLab CE/EE allows remote authenticated users to execute JavaScript in a victim's browser through Jira integration settings. The Jira integration's Banzai Markdown pipeline fails to neutralize attacker-controlled configuration content before rendering it as HTML. Exploitation requires authenticated access to Jira integration configuration and a victim to view the rendered content, enabling browser-context data access or actions.

CVSS severity8.7
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in GitLab CE/EE allows remote authenticated users to execute JavaScript in a victim's browser through Jira integration settings. The Jira integration's Banzai Markdown pipeline fails to neutralize attacker-controlled configuration content before rendering it as HTML. Exploitation requires authenticated access to Jira integration configuration and a victim to view the rendered content, enabling browser-context data access or actions.

The record

CVE
CVE-2023-6033
Published
Dec 1, 2023
Updated
Nov 20, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 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.

  1. Affected versionversion=15.10 <16.4.3
  2. Affected versionversion=16.5 <16.5.3
  3. Affected versionversion=16.6 <16.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=15.10 <16.4.3; version=16.5 <16.5.3; version=16.6 <16.6.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.7GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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