Security readout for executives and security teams
Plain-English summary
Capgo versions before 12.128.2 let a logged-in session change the account email without re-checking the user’s password or confirming the old email. If an attacker already has a valid session cookie or access to an authenticated browser, they could redirect account recovery and weaken MFA protections.
Executive priority
Prioritize remediation for internet-facing or high-trust Capgo environments. The business risk is account takeover through session compromise, with possible loss of control over recovery channels and MFA bypass effects.
Technical view
CVE-2026-56308 is an insufficient authentication issue in Capgo’s email change endpoint, mapped to CWE-640. The flaw has CVSS 4.0 score 8.4. Attack prerequisites include low privileges and user interaction, with high confidentiality and integrity impact. Sources identify Capgo before 12.128.2 as affected.
Likely exposure
Organizations running self-hosted or managed Capgo deployments before 12.128.2 may be exposed, especially where user sessions can be stolen, shared, or left active on unmanaged browsers.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as CISA KEV in the bundle. Practical abuse requires an existing authenticated session or session cookie, not unauthenticated remote access.
Researcher notes
Evidence is limited to the CVE bundle, GitHub advisory reference, and VulnCheck advisory. Do not assume unauthenticated exploitability. Focus validation on version exposure, session security controls, and audit trails for email-change events.
Mitigation direction
- Upgrade Capgo to version 12.128.2 or later if vendor guidance confirms it is fixed there.
- Review vendor advisory GHSA-9px4-w25f-mvm4 for exact remediation instructions.
- Invalidate active sessions after upgrade where account takeover risk is material.
- Monitor account email changes and recovery-setting changes for suspicious activity.
Validation and detection
- Inventory Capgo deployments and record running versions.
- Confirm whether any instance is below 12.128.2.
- Review authentication logs for recent email changes without expected user activity.
- Verify vendor guidance for fixed versions and any required configuration changes.
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-640: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-56308 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
- High
- CVSS
- 8.4 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/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:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N2.15.2VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.4HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/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-9px4-w25f-mvm4)CVE reference, VulnCheck · vendor-advisory
- VulnCheck Advisory: Capgo - Insufficient Authentication in Email Change 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.