---
id: CVE-2023-40034
aliases:
  - GHSA-4gcf-5m39-98mc
  - GO-2023-2014
title: Woodpecker does not validate webhook before changing any data
summary: Woodpecker does not validate webhook before changing any data
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: woodpecker-ci
product: github.com/woodpecker-ci/woodpecker
ecosystem: go
affected:
  - 'github.com/woodpecker-ci/woodpecker >= 1.0.0, < 1.0.2'
patched:
  - github.com/woodpecker-ci/woodpecker 1.0.2
published: '2023-08-16'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:57.379318861Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-4gcf-5m39-98mc'
references:
  - url: >-
      https://github.com/woodpecker-ci/woodpecker/security/advisories/GHSA-4gcf-5m39-98mc
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-40034'
  - url: 'https://github.com/woodpecker-ci/woodpecker/pull/2221'
  - url: 'https://github.com/woodpecker-ci/woodpecker/pull/2222'
  - url: >-
      https://github.com/woodpecker-ci/woodpecker/commit/6e4c2f84cc84661d58cf1c0e5c421a46070bb105
  - url: 'https://github.com/woodpecker-ci/woodpecker'
  - url: 'https://github.com/woodpecker-ci/woodpecker/releases/tag/v1.0.2'
tags:
  - osv
  - go
epss: 0.00883
epssPercentile: 0.577
ingestedAt: '2026-09-12T03:13:01.752Z'
---

## Overview

### Impact
An attacker can post malformed webhook data which leads to an update of the repository data that can e.g. allow the takeover of a repository.
This is only critical if the CI is configured for public usage and connected to a forge witch is also in public usage.

### Patches
Please use either next or the latest v1.0 e.g. v1.0.2

### Workarounds
Secure the CI system by making it inaccessible to untrusted entities, for example, by placing it behind a firewall.

### References
Fix: https://github.com/woodpecker-ci/woodpecker/pull/2221
Backport: https://github.com/woodpecker-ci/woodpecker/pull/2222

## Affected packages

- `github.com/woodpecker-ci/woodpecker >= 1.0.0, < 1.0.2`

## Remediation

Upgrade to a patched release:

- `github.com/woodpecker-ci/woodpecker 1.0.2`