CVE-2024-4099Network attack vector

Prompt-injection concealment via unsanitized AI content

Published Sep 26, 2024 · Updated Sep 27, 2024

Improper output encoding in GitLab EE allows remote attackers to conceal prompt injection in AI-generated content from users. GitLab states only that an AI feature reads unsanitized content; the public advisory does not identify the feature, code locus, or escaping operation. Exploitation requires user interaction and affects 16.0 before 17.2.8, 17.3 before 17.3.4, and 17.4 before 17.4.1, with integrity impact limited to hidden injected instructions.

CVSS severity3.1
Low
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper output encoding in GitLab EE allows remote attackers to conceal prompt injection in AI-generated content from users. GitLab states only that an AI feature reads unsanitized content; the public advisory does not identify the feature, code locus, or escaping operation. Exploitation requires user interaction and affects 16.0 before 17.2.8, 17.3 before 17.3.4, and 17.4 before 17.4.1, with integrity impact limited to hidden injected instructions.

The record

CVE
CVE-2024-4099
Published
Sep 26, 2024
Updated
Sep 27, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-116
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 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=16.0 <17.2.8
  2. Affected versionversion=17.3 <17.3.4
  3. Affected versionversion=17.4 <17.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=16.0 <17.2.8; version=17.3 <17.3.4; version=17.4 <17.4.1

Published CVSS scores

3.1GitLabCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output

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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