CVE-2021-22199Public exploitNetwork attack vector

Stored XSS via unsafe scoped-label descriptions

Published Apr 22, 2021 · Updated Aug 3, 2024

Stored XSS in affected GitLab releases allows remote authenticated users to run script in another user's browser via scoped labels. The Markdown renderer fails to neutralize crafted SVG markup stored in a scoped-label description, so a label tooltip loads attacker-controlled script. Exploitation requires a victim to render and interact with the crafted label; browser behavior and missing CSP on self-managed instances govern reachability.

CVSS severity5.4
Medium
EPSS probability0.79%
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 releases allows remote authenticated users to run script in another user's browser via scoped labels. The Markdown renderer fails to neutralize crafted SVG markup stored in a scoped-label description, so a label tooltip loads attacker-controlled script. Exploitation requires a victim to render and interact with the crafted label; browser behavior and missing CSP on self-managed instances govern reachability.

The record

CVE
CVE-2021-22199
Published
Apr 22, 2021
Updated
Aug 3, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=>=12.9, <13.8.7
  2. Affected versionversion=>=13.10, <13.10.1
  3. Affected versionversion=>=13.9.0, <13.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=12.9, <13.8.7; version=>=13.10, <13.10.1; version=>=13.9.0, <13.9.5

Published CVSS scores

3.5GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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-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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