CVE-2023-1836Public exploitNetwork attack vector

Stored XSS via inline raw XML rendering

Published May 3, 2023 · Updated Jan 29, 2025

Stored cross-site scripting in GitLab 5.1 through 15.9.5, 15.10 through 15.10.4, and 15.11.0 allows remote authenticated users to run script. The raw-file response serves attacker-authored XML inline as plain text, and iOS WebKit honors its XHTML declaration and renders active content. The attacker must publish the XML and persuade an iOS user to open its raw URL; ineffective CSP permits same-origin script execution, while GitLab.com's CSP limits the demonstrated impact to content injection, redirects, and phishing.

CVSS severity4.3
Medium
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored cross-site scripting in GitLab 5.1 through 15.9.5, 15.10 through 15.10.4, and 15.11.0 allows remote authenticated users to run script. The raw-file response serves attacker-authored XML inline as plain text, and iOS WebKit honors its XHTML declaration and renders active content. The attacker must publish the XML and persuade an iOS user to open its raw URL; ineffective CSP permits same-origin script execution, while GitLab.com's CSP limits the demonstrated impact to content injection, redirects, and phishing.

The record

CVE
CVE-2023-1836
Published
May 3, 2023
Updated
Jan 29, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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=>=15.10, <15.10.5
  2. Affected versionversion=>=15.11, <15.11.1
  3. Affected versionversion=>=5.1, <15.9.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=15.10, <15.10.5; version=>=15.11, <15.11.1; version=>=5.1, <15.9.6

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.3GitLabCVSS:3.1/AV:N/AC:H/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 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo