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CVE-2026-56336VulnerabilityPublished

Capgo versions before 12.128.2 have an information disclosure vulnerability in an unauthenticated endpoint (/private/sso/check-domain) that reveals internal organization and provider identifiers

Affects capgoSource GCVE Database

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 12.128.2 when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 27% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 12.128.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade cap-go/capgo to 12.128.2.

Affected software

ProductAffectedFixed in
GitHubcap-go/capgopkg:github/cap-go/capgoOther threatsAffected
  • <12.128.2
Fixed in
  • 12.128.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, restricting access to the /private/sso/check-domain endpoint or implementing authentication controls may reduce exposure.

Description

Capgo versions before 12.128.2 have an information disclosure vulnerability in an unauthenticated endpoint (/private/sso/check-domain) that reveals internal organization and provider identifiers. This allows attackers to enumerate email domains and map them to organization UUIDs and SSO provider IDs, facilitating reconnaissance against Capgo tenants.

References

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