Security readout for executives and security teams
Plain-English summary
Capgo versions before 12.128.2 can expose internal organization and SSO provider identifiers through an unauthenticated SSO domain-check endpoint. This does not directly compromise accounts, but it can help attackers map tenants and prepare targeted reconnaissance against organizations using Capgo SSO.
Executive priority
Prioritize remediation in normal vulnerability management cycles, faster for internet-facing Capgo or sensitive SSO environments. The issue supports attacker reconnaissance but sources do not show direct account takeover, data alteration, service disruption, or active exploitation.
Technical view
CVE-2026-56336 is a CWE-200 information disclosure issue in Capgo’s unauthenticated /private/sso/check-domain endpoint. The endpoint may return internal org_id and provider_id values, allowing email-domain enumeration and tenant-to-SSO-provider mapping. The CVSS 4.0 score is 6.9, with network access, low complexity, no privileges, and no user interaction required.
Likely exposure
Exposure is likely limited to Capgo deployments running versions before 12.128.2 where the affected endpoint is reachable. Organizations using Capgo with SSO should treat this as reconnaissance-enabling data leakage rather than immediate system compromise.
Exploitation context
The source bundle does not indicate CISA KEV listing or confirmed active exploitation. The risk is unauthenticated remote information disclosure that could support phishing, tenant profiling, or follow-on targeting against Capgo customers.
Researcher notes
Evidence is consistent across the CVE record, GitHub advisory, and VulnCheck advisory. The affected range is Capgo before 12.128.2. Available sources identify information disclosure of org_id and provider_id values but do not provide evidence of exploitation in the wild.
Mitigation direction
- Upgrade Capgo to 12.128.2 or later, based on vendor advisory guidance.
- Restrict external access to unnecessary Capgo private endpoints where operationally feasible.
- Review SSO configuration exposure and tenant identifiers for unnecessary disclosure.
- Monitor vendor advisory updates for any revised remediation instructions.
Validation and detection
- Inventory all Capgo deployments and confirm running versions.
- Verify whether any deployment is earlier than 12.128.2.
- Check whether the affected SSO domain-check endpoint is externally reachable.
- Review access logs for unusual unauthenticated domain-check activity.
- Confirm remediation by validating the deployed fixed version.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-56336 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4VulnCheckVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- GitHub Security Advisory (GHSA-c5jf-5wxg-mgrq)CVE reference, VulnCheck · vendor-advisory
- VulnCheck Advisory: Capgo - Information Disclosure via Unauthenticated SSO check-domain EndpointCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.