CVE-2023-40034Network attack vector

Repository takeover via pre-verification webhook updates

Published Aug 16, 2023 · Updated Oct 2, 2024

Improper input validation in Woodpecker CI Woodpecker 1.0.0 through 1.0.1 allows remote attackers to take over repositories via malformed webhooks. PostHook persisted repository metadata derived from parsed webhook data before token.ParseRequest verified the webhook's authorization. Exploitation requires a publicly reachable CI instance connected to a publicly accessible forge, and unauthorized updates can redirect repository control.

CVSS severity8.1
High
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Woodpecker CI Woodpecker 1.0.0 through 1.0.1 allows remote attackers to take over repositories via malformed webhooks. PostHook persisted repository metadata derived from parsed webhook data before token.ParseRequest verified the webhook's authorization. Exploitation requires a publicly reachable CI instance connected to a publicly accessible forge, and unauthorized updates can redirect repository control.

The record

CVE
CVE-2023-40034
Published
Aug 16, 2023
Updated
Oct 2, 2024
Vendor
Woodpecker CI
Product
Woodpecker
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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=>= 1.0.0, < 1.0.2
  2. Affected versionversion=1.0.0 <1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Woodpecker CI · Woodpeckerversion=>= 1.0.0, < 1.0.2; version=1.0.0 <1.0.2

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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-20Improper Input Validation
T1190Exploit Public-Facing Application

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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