Security readout for executives and security teams
Plain-English summary
This flaw affects Auth0 Passport-SharePoint before 0.4.0. The package processed access tokens without first validating their JWT signatures, so an attacker could forge a token and bypass authentication or authorization checks in affected applications.
Executive priority
Prioritize remediation for any production application using this package, especially where SharePoint access protects sensitive business data. The business risk is unauthorized access through forged identity tokens, even though public exploitation is not confirmed in the supplied sources.
Technical view
CVE-2019-13483 is a JWT signature validation failure in Auth0 Passport-SharePoint before 0.4.0. If an application relied on this package for SharePoint authentication decisions, forged access tokens could be accepted as legitimate, undermining identity and permission enforcement.
Likely exposure
Exposure is likely limited to applications that integrated Auth0 Passport-SharePoint before 0.4.0. Asset inventories should look for that package; the provided CVE metadata does not enumerate CPEs or downstream products.
Exploitation context
The sources describe a token-forgery authentication and authorization bypass. They do not cite active exploitation, public exploit availability, or CISA KEV listing, so exploitation status should be treated as unconfirmed.
Researcher notes
The source bundle lacks CVSS, CWE, CPE, and downstream product detail. The core issue is clear: access tokens were processed before JWT signature validation. Validation should focus on dependency presence, version, and whether the package influenced authorization decisions.
Mitigation direction
- Upgrade Auth0 Passport-SharePoint to 0.4.0 or later where used.
- Review the Auth0 security bulletin before production rollout.
- Inventory applications using Passport-SharePoint for SharePoint authentication.
- Check vendor guidance for any additional remediation steps.
- Investigate suspicious authentication activity if vulnerable versions were exposed.
Validation and detection
- Search dependency manifests for passport-sharepoint versions before 0.4.0.
- Confirm deployed builds match the remediated package version.
- Review authentication code paths that rely on Passport-SharePoint token validation.
- Check logs for unusual SharePoint access token usage.
- Verify no unsupported fork preserves the vulnerable validation behavior.
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
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Credential 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-2019-13483 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://auth0.com/docs/security/bulletins/cve-2019-13483CVE reference · x_refsource_MISC
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.