CVE-2020-13267Public exploitNetwork attack vector

Stored XSS via unescaped default branch name

Published Jun 10, 2020 · Updated Aug 4, 2024

Stored XSS in affected GitLab CE/EE releases before 13.0.1 allows remote attackers to execute JavaScript through a crafted branch name. The metrics-dashboard duplication modal inserts the repository's default branch name without escaping it, so stored markup becomes executable content. Execution occurs when a user with Reporter access or higher opens the modal, allowing the script to act through that user's session.

CVSS severity6.1
Medium
EPSS probability1.75%
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 affected GitLab CE/EE releases before 13.0.1 allows remote attackers to execute JavaScript through a crafted branch name. The metrics-dashboard duplication modal inserts the repository's default branch name without escaping it, so stored markup becomes executable content. Execution occurs when a user with Reporter access or higher opens the modal, allowing the script to act through that user's session.

The record

CVE
CVE-2020-13267
Published
Jun 10, 2020
Updated
Aug 4, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=>=12.10, <12.10.7
  2. Affected versionversion=>=12.8, <12.9.8
  3. Affected versionversion=>=13.0, <13.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=>=12.10, <12.10.7; version=>=12.8, <12.9.8; version=>=13.0, <13.0.1

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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