CVE-2026-56329Public exploitNetwork attack vector

Cross-tenant preview denial via namespace collision

Published Jul 10, 2026 · Updated Jul 10, 2026

Namespace collision in Capgo before 12.128.2 allows remote authenticated users to deny victim applications preview access. Preview hostname parsing non-bijectively decodes double underscores as dots, so an underscored app ID can resolve to another tenant's dotted app ID. Exploitation requires registering the colliding identifier and results in preview misrouting rather than loss of production application data.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Namespace collision in Capgo before 12.128.2 allows remote authenticated users to deny victim applications preview access. Preview hostname parsing non-bijectively decodes double underscores as dots, so an underscored app ID can resolve to another tenant's dotted app ID. Exploitation requires registering the colliding identifier and results in preview misrouting rather than loss of production application data.

The record

CVE
CVE-2026-56329
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Capgo
Product
Capgo
Classifications
CWE-706, CWE-436
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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 privilegesauthenticated

What is affected?

Capgo · Capgoversion=0 <12.128.2

Published CVSS scores

6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L

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

Weakness, pattern, technique

CWE-706Use of Incorrectly-Resolved Name or Reference
CWE-436Interpretation Conflict

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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