CVE-2023-40034 is a high-severity (CVSS 8.1) Improper Input Validation vulnerability in github.com/woodpecker-ci/woodpecker. A fix is available for github.com/woodpecker-ci/woodpecker — see the affected versions and patch details below.
Repositoty takeover in woodpecker-ci
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-40034.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
github.com/woodpecker-ci/woodpeckerReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Woodpecker is a community fork of the Drone CI system. In affected versions an attacker can post malformed webhook data witch lead to an update of the repository data that can e.g. allow the takeover of an repo. This is only critical if the CI is configured for public usage and connected to a forge witch is also in public usage. This issue has been addressed in version 1.0.2. Users are advised to upgrade. Users unable to upgrade should secure the CI system by making it inaccessible to untrusted entities, for example, by placing it behind a firewall.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/woodpecker-ci/woodpecker | ≥ 1.0.0&&< 1.0.2 | 1.0.2go get github.com/woodpecker-ci/woodpecker@v1.0.2 |
Affected Products
woodpeckerwoodpecker-ciDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/woodpecker-ci/woodpecker, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/woodpecker-ci/woodpecker to 1.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-40034 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2023-40034 in your dependencies?
Find it across Go, including transitive dependencies.