CVE-2025-1908Network attack vector

Account takeover via injected Network Error Logging headers

Published Apr 24, 2025 · Updated Apr 24, 2025

NEL header injection in GitLab CE and EE allows remote authenticated users to track browsing activity and take over accounts. GitLab identifies the Maven Dependency Proxy as the locus but has not disclosed which response-building operation accepts the injected header. Exploitation requires low-privileged access, a high-complexity setup, and user interaction; the resulting browser telemetry can expose activity and enable account takeover.

CVSS severity7.7
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NEL header injection in GitLab CE and EE allows remote authenticated users to track browsing activity and take over accounts. GitLab identifies the Maven Dependency Proxy as the locus but has not disclosed which response-building operation accepts the injected header. Exploitation requires low-privileged access, a high-complexity setup, and user interaction; the resulting browser telemetry can expose activity and enable account takeover.

The record

CVE
CVE-2025-1908
Published
Apr 24, 2025
Updated
Apr 24, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-840
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=16.6 <17.9.7
  2. Affected versionversion=17.10 <17.10.5
  3. Affected versionversion=17.11 <17.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=16.6 <17.9.7; version=17.10 <17.10.5; version=17.11 <17.11.1

Published CVSS scores

7.7GitLabCVSS:3.1/AV:N/AC:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-840Business Logic Errors

Public exploit references

No public exploit references are available in this record.

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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