CVE-2026-56331Public exploitNetwork attack vector

Information disclosure via failed invitation coercion

Published Jun 30, 2026 · Updated Jun 30, 2026

Information disclosure in Capgo before 12.128.2 allows remote attackers to expose internal processing details via a malformed invitation token. The /private/accept_invitation handler queries tmp_users and coerces an empty result into a single JSON object, returning the resulting database error in an HTTP 500 response. Only the public key is required; malformed magic_invite_string values expose lookup and coercion details and generate server errors without changing data.

CVSS severity6.9
Medium
EPSS probability0.34%
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 internal processing details via a malformed invitation token. The /private/accept_invitation handler queries tmp_users and coerces an empty result into a single JSON object, returning the resulting database error in an HTTP 500 response. Only the public key is required; malformed magic_invite_string values expose lookup and coercion details and generate server errors without changing data.

The record

CVE
CVE-2026-56331
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Capgo
Product
Capgo
Classifications
CWE-209, T1595.002
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

5.3VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
T1595.002Vulnerability Scanning

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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