Security readout for executives and security teams
Plain-English summary
CVE-2018-20595 is a CSRF flaw in hsweb 3.0.4's OAuth2 client handling. After authentication succeeds, the application did not compare the request state value with the session state value. That weakens a standard OAuth2 protection and can expose login or authorization flows to tampering.
Executive priority
Treat as a targeted authentication-flow risk, not an internet-wide emergency based on current evidence. Prioritize systems using hsweb 3.0.4 OAuth2 login, especially public-facing or customer-facing deployments.
Technical view
The reported issue is in web/authorization/oauth2/controller/OAuth2ClientController.java. The OAuth2 state parameter was not validated against the session after successful user authentication. Sources do not provide CVSS, CWE mapping, fixed release numbers, or detailed impact boundaries.
Likely exposure
Exposure is most likely limited to systems running hsweb 3.0.4 with OAuth2 client functionality reachable by users. The provided metadata does not identify CPEs, downstream products, or affected hosted services.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle. No cited source claims active exploitation. The issue relates to OAuth2 CSRF protection failure, but exploitability depends on deployment and authentication flow details not provided here.
Researcher notes
The public record is sparse. The core finding is clear, but severity, exploit status, affected CPEs, and fixed versions are not included in the supplied sources. Avoid broad claims beyond hsweb 3.0.4 and the OAuth2 state validation defect.
Mitigation direction
- Check vendor guidance and the referenced GitHub issue or commit.
- Upgrade to a fixed hsweb release if one is available.
- Apply the upstream commit or equivalent state validation if maintaining a fork.
- Restrict and monitor OAuth2 callback routes until remediation is verified.
Validation and detection
- Inventory applications using hsweb 3.0.4.
- Confirm whether OAuth2 client login is enabled and externally reachable.
- Review OAuth2 controller logic for request-versus-session state comparison.
- Verify deployed code includes the referenced upstream fix or equivalent behavior.
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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CVE-2018-20595 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://github.com/hs-web/hsweb-framework/commit/40929e9b0d336a26281a5ed2e0e721d54dd8d2f2CVE reference · x_refsource_MISC
- https://github.com/hs-web/hsweb-framework/issues/107CVE 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.