CVE-2020-13269Public exploitNetwork attack vector

Arbitrary JavaScript execution via unvalidated return_url scheme

Published Jun 10, 2020 · Updated Aug 4, 2024

Reflected XSS in GitLab CE/EE 12.10 through 12.10.6 and 13.0.0 allows remote attackers to execute JavaScript via the Static Site Editor. The editor accepts a return_url query value with the javascript scheme and uses it as a navigation target instead of restricting it to HTTP or HTTPS URLs. A victim with Developer access to an attacker-controlled public project must open the crafted editor link and click a button; the script then runs in the GitLab origin and can act with the victim'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

Reflected XSS in GitLab CE/EE 12.10 through 12.10.6 and 13.0.0 allows remote attackers to execute JavaScript via the Static Site Editor. The editor accepts a return_url query value with the javascript scheme and uses it as a navigation target instead of restricting it to HTTP or HTTPS URLs. A victim with Developer access to an attacker-controlled public project must open the crafted editor link and click a button; the script then runs in the GitLab origin and can act with the victim's session.

The record

CVE
CVE-2020-13269
Published
Jun 10, 2020
Updated
Aug 4, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1203
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

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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=>=12.10, <12.10.7
  2. 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=>=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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
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

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Your stack

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