EUVD-2026-38430
GHSA-2c7m-fxr4-462c
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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
Network-reachable PostgREST endpoint (AV:N/AC:L), requires a valid plaintext API key so PR:L not PR:N, no UI, high C/I over tenant data, no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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
Lifecycle Timeline
2DescriptionCVE.org
Capgo before 12.128.2 contains a security control bypass vulnerability where the PostgREST/RLS plane accepts plaintext API keys through the capgkey header despite enforce_hashed_api_keys being enabled. Attackers can bypass org-level hashed-key enforcement by sending plaintext API keys directly to the PostgREST/RLS plane to access protected resources.
AnalysisAI
Authentication bypass in Capgo before 12.128.2 allows authenticated attackers to defeat the org-level hashed-API-key control by submitting plaintext API keys via the capgkey header directly to the PostgREST/RLS plane. Despite the enforce_hashed_api_keys setting being toggled on, the data plane fails to honor that policy, granting access to protected resources. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) a Capgo deployment running a version prior to 12.128.2, (2) the org-level enforce_hashed_api_keys setting being enabled (otherwise there is no enforcement to bypass - only deployments that opted into hashed-only mode are meaningfully exposed to this specific bug), (3) network reachability to the PostgREST/RLS plane (matching CVSS AV:N), and (4) attacker possession of a valid plaintext API key that was issued for the target org, which is what PR:L in the vector reflects. … 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/VC:H/VI:H/VA:N) reflects a network-reachable, low-complexity bypass requiring some level of pre-existing privilege (a valid plaintext API key) and yielding high confidentiality and integrity impact with no availability impact - consistent with an authorization-boundary failure rather than RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a previously-issued plaintext Capgo API key - for example, one leaked in a git history, mobile app bundle, or CI log - sends an HTTP request with that key in the capgkey header directly to the Capgo PostgREST/RLS endpoint. Even though the victim org has set enforce_hashed_api_keys to require hashed keys only, the request is accepted and the attacker reads or modifies tenant data within the scope of that key. … |
| Remediation | Vendor-released patch: upgrade Capgo to 12.128.2 or later, as documented in the GitHub Security Advisory GHSA-6g74-8cpq-g2c8 (https://github.com/Cap-go/capgo/security/advisories/GHSA-6g74-8cpq-g2c8) and the VulnCheck writeup (https://www.vulncheck.com/advisories/capgo-hashed-api-key-enforcement-bypass-via-postgrest-rls-plane). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Capgo instances running versions prior to 12.128.2, document current API key configurations, and assess which systems contain sensitive data. …
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Same technique Authentication Bypass
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External POC / Exploit Code
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