GHSA-42q8-ww2w-fgmm
Capgo versions before 12.128.2 have a vulnerability in the preview hostname parsing logic where double underscores are decoded to dots in a non-bijective manner. This flaw allows attackers to register application IDs containing underscores that collide with other tenants' dotted app IDs, leading to cross-tenant preview namespace collisions. As a result, preview requests can be misrouted, causing denial of preview access for affected tenant applications.
AI Analysis
Technical Summary
The vulnerability in Capgo prior to version 12.128.2 arises from improper decoding of double underscores to dots in preview hostname parsing. This non-bijective decoding enables attackers to create app IDs with underscores that collide with other tenants' app IDs that use dots, resulting in cross-tenant namespace collisions. This can cause preview misrouting and denial of preview access for victim tenants. The issue is classified under CWE-436 (Improper Neutralization of Special Elements). No known exploits in the wild have been reported. No patch information is provided in the data.
Potential Impact
Attackers can exploit this vulnerability to cause denial of preview access for other tenants by registering colliding app IDs, potentially disrupting development or testing workflows. There is no indication of remote code execution or data leakage, but the misrouting impacts tenant isolation and availability of preview environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor communications for updates. Until a fix is available, avoid registering app IDs with underscores that could collide with dotted app IDs or restrict app ID registration policies if possible.
GHSA-42q8-ww2w-fgmm
Description
Capgo versions before 12.128.2 have a vulnerability in the preview hostname parsing logic where double underscores are decoded to dots in a non-bijective manner. This flaw allows attackers to register application IDs containing underscores that collide with other tenants' dotted app IDs, leading to cross-tenant preview namespace collisions. As a result, preview requests can be misrouted, causing denial of preview access for affected tenant applications.
CVSS v4.0
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Capgo prior to version 12.128.2 arises from improper decoding of double underscores to dots in preview hostname parsing. This non-bijective decoding enables attackers to create app IDs with underscores that collide with other tenants' app IDs that use dots, resulting in cross-tenant namespace collisions. This can cause preview misrouting and denial of preview access for victim tenants. The issue is classified under CWE-436 (Improper Neutralization of Special Elements). No known exploits in the wild have been reported. No patch information is provided in the data.
Potential Impact
Attackers can exploit this vulnerability to cause denial of preview access for other tenants by registering colliding app IDs, potentially disrupting development or testing workflows. There is no indication of remote code execution or data leakage, but the misrouting impacts tenant isolation and availability of preview environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor communications for updates. Until a fix is available, avoid registering app IDs with underscores that could collide with dotted app IDs or restrict app ID registration policies if possible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-42q8-ww2w-fgmm
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-56329"]
- Ecosystems
- []
- Database Specific Severity
- MODERATE
- Cvss Version
- 4.0
Threat ID: 6a520eec68715ace4391d5bb
Added to database: 07/11/2026, 09:37:48 UTC
Last enriched: 07/11/2026, 10:09:42 UTC
Last updated: 07/11/2026, 19:47:31 UTC
Views: 2
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