CVE-2026-56300Public exploitNetwork attack vector

Unauthenticated identity and permission disclosure via RPC oracles

Published Jun 30, 2026 · Updated Jun 30, 2026

Information disclosure in Capgo before 12.128.2 allows remote attackers to expose user and authorization metadata through Supabase RPCs. The get_user_id and get_org_perm_for_apikey SECURITY DEFINER functions execute for anon and return distinct results for invalid keys, missing apps, user UUIDs, and permission levels. Only the public Supabase publishable key is required; the results validate already-obtained API keys and reveal identity and authorization metadata without granting direct data modification.

CVSS severity8.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Capgo before 12.128.2 allows remote attackers to expose user and authorization metadata through Supabase RPCs. The get_user_id and get_org_perm_for_apikey SECURITY DEFINER functions execute for anon and return distinct results for invalid keys, missing apps, user UUIDs, and permission levels. Only the public Supabase publishable key is required; the results validate already-obtained API keys and reveal identity and authorization metadata without granting direct data modification.

The record

CVE
CVE-2026-56300
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Capgo
Product
Capgo
Classifications
CWE-200, T1087.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <12.128.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Capgo · Capgoversion=0 <12.128.2

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1087.004Cloud Account

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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