EUVD-2026-38171
GHSA-33r3-cpxm-4xg2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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
Network-reachable, no privileges or interaction needed; impact is limited to low availability disruption with no confidentiality or integrity consequence.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 an authentication bypass vulnerability in the /build/upload/:jobId/* endpoint that allows unauthenticated attackers to trigger consistent 500 errors. Remote attackers can send OPTIONS requests to bypass authentication middleware and invoke tusProxy logic with invalid credentials, enabling trivial request flooding and denial of service.
AnalysisAI
Authentication bypass in Capgo's /build/upload/:jobId/* endpoint exposes all versions before 12.128.2 to unauthenticated denial of service. Remote attackers exploit HTTP OPTIONS request handling to sidestep authentication middleware entirely, forcing tusProxy to execute with invalid credentials and reliably producing HTTP 500 errors at scale. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required - the vulnerability is triggered by the HTTP OPTIONS method against the /build/upload/:jobId/* endpoint, which bypasses Capgo's authentication middleware entirely on all versions before 12.128.2. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 (Medium) reflects the realistic bounded impact: the vulnerability is highly accessible (AV:N, AC:L, PR:N, UI:N) but limited in consequence (VA:L, VC:N, VI:N - no data exposure or integrity loss). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with no credentials sends a high-volume stream of HTTP OPTIONS requests to https://[capgo-host]/build/upload/[arbitrary-jobId]/[path] on an internet-exposed Capgo instance. Each request bypasses authentication middleware, reaches tusProxy with invalid credentials, and returns an HTTP 500 error, degrading service for legitimate build pipeline consumers. … |
| Remediation | Upgrade Capgo to version 12.128.2 or later; this is the vendor-confirmed fix per the GitHub security advisory GHSA-6c7m-4223-446j. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Cross-domain SSO account takeover in Capgo before 12.128.2 allows an attacker with enterprise org admin access and a mal
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Authentication bypass in Capgo prior to version 12.128.2 lets attackers defeat email-based OTP verification by tampering
Rate-limit bypass in Capgo versions prior to 12.128.2 lets remote unauthenticated attackers flood the channel_self endpo
Cross-tenant data poisoning in Supabase Capgo before 12.128.2 allows remote unauthenticated attackers to corrupt billing
Server-side privilege escalation in Capgo before 12.128.2 lets authenticated users holding build permissions abuse a pat
Unauthenticated information disclosure in Capgo before 12.128.2 lets remote attackers query the /functions/v1/channel_se
Account takeover in Capgo before 12.128.2 stems from a password-change endpoint that omits current-password validation (
Information disclosure in Capgo (Capacitor live-update/OTA platform) before 12.128.2 lets unauthenticated callers abuse
Unauthenticated information disclosure in Capgo before 12.128.2 lets remote attackers read organization RBAC role bindin
Cross-tenant authorization bypass in Capgo before 12.128.2 lets authenticated users impersonate another tenant's limited
Same technique Authentication Bypass
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External POC / Exploit Code
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