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CVE-2026-56329

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fb78a5db7944ee0fe0f2212510928fec07eb5f99b18ba66052ebf7ec3aea1d5c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NO…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Capgo","vendor":"Capgo","versions":[{"lessThan":"12.128.2","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"12.128.2","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NO…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-436","description":"Interpretation Conflict","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["exploit"],"url":"https://github.com/Cap-go/capgo/security/advisories/GHSA-76qq-gg2p-pwwj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/adp/0/references/0
{"name":"GitHub Security Advisory (GHSA-76qq-gg2p-pwwj)","tags":["vendor-advisory"],"url":"https://github.com/Cap-go/capgo/security/advisories/GHSA-76qq-gg2p-pwwj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/references/0
{"name":"VulnCheck Advisory: Capgo - Cross-Tenant Preview Namespace Collision via Non-Bijective Underscore Decoding","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/capgo-cross-tenant-preview-namespace-collision-via-non-bijective-underscore-decoding"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:800a2e5005bedbcf3ee47b0f36776d23f6e02c94895cffa907cb2751789a84dd · sha256:4443d58d38feafed… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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