Which versions of Woodpecker CI are affected by EUVD-2026-37897?

Organizations running Woodpecker CI 3.0.0 through 3.14.0 face a critical identity spoofing vulnerability where authenticated agents can impersonate other agents and hijack CI jobs, potentially…. A patch is available.

Is there a public PoC exploit available for EUVD-2026-37897?

Yes, a public proof-of-concept exploit is available for EUVD-2026-37897. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate EUVD-2026-37897?

24 hours: Audit all Woodpecker CI deployments for versions 3.0.0-3.14.0; document current agent credentials and job execution privileges. 7 days: Rotate all agent credentials; implement network segmentation isolating CI agents; review gRPC logs for suspicious metadata injection patterns; restrict job execution permissions by agent role. 30 days: Evaluate vendor roadmap for patch availability; implement comprehensive role-based access controls limiting each agent's execution scope to required jobs only; establish threat detection for anomalous agent behavior.

Woodpecker CI EUVD-2026-37897

Q: What is the CVSS score of EUVD-2026-37897?

EUVD-2026-37897 has a CVSS 4.0 base score of 7.1 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

| CVE-2026-50141 HIGH

Authentication Bypass by Spoofing (CWE-290)

2026-06-18 security-advisories@github.com

GHSA-g7mm-9vx7-jm7h

Authentication Bypass Suse

7.1

CVSS 4.0 · Vendor: github

Severity by source

Vendor (github) PRIMARY

7.1 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

6.5 MEDIUM

Remotely reachable gRPC endpoint (AV:N), straightforward metadata injection (AC:L), valid agent token required (PR:L), no user interaction; impersonation tampers with CI integrity (I:H) with no direct C/A impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SUSE

MEDIUM

qualitative

Primary rating from Vendor (github).

CVSS VectorVendor: github

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Jun 18, 2026 - 17:02 EUVD

Source Code Evidence Fetched

Jun 18, 2026 - 14:32 vuln.today

Analysis Generated

Jun 18, 2026 - 14:32 vuln.today

DescriptionCVE.org

Woodpecker is a CI/CD engine. Starting in version 3.0.0 and prior to version 3.14.1, a vulnerability in Woodpecker CI's gRPC layer allowed any authenticated agent to impersonate any other agent on the same server by injecting a forged agent_id value into outgoing gRPC metadata. The server correctly verified the JWT token but then discarded the verified agent identity in favor of the client-supplied value. Version 3.14.1 patches the issue. As a workaround, disable org agents (WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true) and delete existing ones.

AnalysisAI

Agent impersonation in Woodpecker CI 3.0.0 through 3.14.0 allows any authenticated agent to assume the identity of any other agent on the same server by injecting a forged agent_id into outgoing gRPC metadata. The server validates the JWT correctly but then trusts the client-supplied agent_id over the cryptographically verified one, enabling cross-tenant job hijacking and integrity compromise of CI pipelines. No public exploit identified at time of analysis, and the issue is not listed in CISA KEV.

Technical ContextAI

Woodpecker is a Go-based open-source CI/CD engine whose server-agent channel uses gRPC with JWT-bearing metadata for authentication. The defect is a CWE-290 Authentication Bypass by Spoofing in server/rpc/authorizer.go: after parsing JWT claims, the authorizer called md.Append("agent_id", ...), which adds the verified value alongside any client-supplied value rather than replacing it. Downstream gRPC handlers read the first agent_id from metadata, allowing a malicious agent to prepend an arbitrary numeric agent_id and override the trusted claim. The fix in PR #6567 changes Append to Set so the server-derived identity always wins, eliminating the metadata collision.

RemediationAI

Vendor-released patch: upgrade Woodpecker CI server to 3.14.1 or later, per advisory GHSA-g7mm-9vx7-jm7h (https://github.com/woodpecker-ci/woodpecker/security/advisories/GHSA-g7mm-9vx7-jm7h). Until the upgrade is applied, the vendor's workaround is to disable user/org agent registration by setting WOODPECKER_DISABLE_USER_AGENT_REGISTRATION=true and then deleting any existing user-registered agents so only server-trusted agents remain; this prevents low-privileged tenants from obtaining the agent token needed to mount the spoof, at the cost of removing self-service agent provisioning. Operators should also rotate any agent JWTs that may have been issued during the vulnerable window and audit recent pipeline runs for jobs picked up by unexpected agents.