CVE-2025-0475Public exploitNetwork attack vector

Cross-site scripting via missing proxy content type

Published Mar 3, 2025 · Updated Mar 3, 2025

Cross-site scripting in GitLab CE/EE 15.10 through 17.7.5, 17.8 through 17.8.3, and 17.9.0 allows remote authenticated users to execute JavaScript. The Kubernetes proxy endpoint passed responses with no Content-Type header because checkContentType iterated only over present headers, so browsers MIME-sniffed attacker-controlled HTML. Exploitation requires a regular account, a self-hosted instance with a configured Kubernetes Agent proxy, cache priming, and victim interaction; successful attacks execute script in the GitLab origin.

CVSS severity8.7
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in GitLab CE/EE 15.10 through 17.7.5, 17.8 through 17.8.3, and 17.9.0 allows remote authenticated users to execute JavaScript. The Kubernetes proxy endpoint passed responses with no Content-Type header because checkContentType iterated only over present headers, so browsers MIME-sniffed attacker-controlled HTML. Exploitation requires a regular account, a self-hosted instance with a configured Kubernetes Agent proxy, cache priming, and victim interaction; successful attacks execute script in the GitLab origin.

The record

CVE
CVE-2025-0475
Published
Mar 3, 2025
Updated
Mar 3, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 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 <17.7.6
  2. Affected versionversion=17.8 <17.8.4
  3. Affected versionversion=17.9 <17.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=15.10 <17.7.6; version=17.8 <17.8.4; version=17.9 <17.9.1

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.7GitLabCVSS: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 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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