EUVD-2026-38738Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/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
Authenticated low-priv tenant user (PR:L) hits network endpoint with no UI; cross-tenant impact crosses authorization scope (S:C); availability High from build cancellation, C/I Low.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/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
Lifecycle Timeline
2DescriptionCVE.org
Capgo before 12.128.2 contains a broken object level authorization (BOLA) vulnerability in the POST /build/start/:jobId and POST /build/cancel/:jobId endpoints. The handlers authorize the request based only on the attacker-controlled app_id supplied in the request body and never verify that the jobId in the URL belongs to that app_id (or the same tenant/org) before issuing privileged builder commands with the server-held builder API key. An authenticated user with the app.build_native permission for any app they control can start or cancel arbitrary builder jobs belonging to other tenants by supplying a victim jobId, resulting in cross-tenant build sabotage (denial of service), unauthorized compute actions, and potential billing impact.
AnalysisAI
Cross-tenant build sabotage in Capgo before 12.128.2 allows authenticated users with the app.build_native permission to start or cancel arbitrary builder jobs belonging to other tenants by supplying a victim jobId to the /build/start/:jobId and /build/cancel/:jobId endpoints. The handlers trust the attacker-supplied app_id in the request body and never verify jobId ownership, enabling denial of service, unauthorized compute consumption, and billing impact across tenants. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated Capgo account that holds the app.build_native permission on at least one app the attacker controls (so PR:L, not unauthenticated), and knowledge or guess of a victim jobId for the /build/start/:jobId or /build/cancel/:jobId endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) and score of 7.2 are consistent with the described condition: a low-privileged but authenticated tenant user can reach the endpoints over the network with no user interaction and no special attack requirements, and the VA:H reflects the high availability impact of cancelling or hijacking other tenants' production builds. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers (or already holds) a Capgo tenant with at least one app and grants themselves app.build_native on it, then enumerates or guesses victim jobIds - for example numeric or UUID identifiers leaked via logs, status pages, or prior interactions - and issues POST /build/cancel/:victimJobId with their own app_id in the body, causing the trusted builder to terminate the victim's in-flight production build. Repeating the pattern against /build/start/:jobId lets the attacker re-trigger or replay builder jobs on other tenants' behalf, racking up compute charges and disrupting release pipelines. … |
| Remediation | Vendor-released patch: upgrade Capgo to 12.128.2 or later, which adds tenant/ownership verification linking the :jobId path parameter to the caller's app_id and organization before issuing builder commands; consult the GHSA advisory at https://github.com/Cap-go/capgo/security/advisories/GHSA-72j4-9qp5-hfrg for fix details. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Restrict app.build_native permission to essential administrators only and audit current assignments. …
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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