PT-2026-57173 · Cap Go · Cap-Go

Judel777 · Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-56329

Mitre

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L

Capgo before 12.128.2 contains a cross-tenant preview namespace collision vulnerability caused by non-bijective decoding of double underscores to dots in preview hostname parsing. Attackers can register app IDs with underscores that collide with other tenants' dotted app IDs, causing preview misrouting and denial of preview access for victim applications.

Exploit

Fix

Weakness Enumeration

CWE-436

Related Identifiers

CVE-2026-56329

Affected Products

Cap-Go

References · 3

• 🔥 https://github.com/Cap-go/capgo/security/advisories/GHSA-76qq-gg2p-pwwj · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-56329 · Security Note
• https://vulncheck.com/advisories/capgo-cross-tenant-preview-namespace-collision-via-non-bijective-underscore-decoding · Note