CVE-2023-0838Network attack vector

Masked webhook secret disclosure via added URL parameter

Published Apr 5, 2023 · Updated Feb 10, 2025

Information disclosure in GitLab 15.1 through 15.8.4, 15.9 through 15.9.3, and 15.10.0 allows remote authenticated users to obtain webhook secrets. The webhook URL update path accepts an added parameter referencing a masked URL variable, which request generation interpolates into a request sent to the modified endpoint. A project maintainer must control the webhook settings, and the webhook must already contain a masked URL secret; the resulting request discloses that secret.

CVSS severity5.5
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in GitLab 15.1 through 15.8.4, 15.9 through 15.9.3, and 15.10.0 allows remote authenticated users to obtain webhook secrets. The webhook URL update path accepts an added parameter referencing a masked URL variable, which request generation interpolates into a request sent to the modified endpoint. A project maintainer must control the webhook settings, and the webhook must already contain a masked URL secret; the resulting request discloses that secret.

The record

CVE
CVE-2023-0838
Published
Apr 5, 2023
Updated
Feb 10, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-200, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2025Record 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=>=15.10, <15.10.1
  2. Affected versionversion=>=15.1, <15.8.5
  3. Affected versionversion=>=15.9, <15.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=15.10, <15.10.1; version=>=15.1, <15.8.5; version=>=15.9, <15.9.4

Published CVSS scores

5.5GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
3.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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.

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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-200Exposure of Sensitive Information to an Unauthorized Actor
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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