Security readout for executives and security teams
Plain-English summary
This issue can cause a Ktor HTTP client to leak an Authorization header when following a redirect. If a trusted request is redirected to another location, credentials such as bearer tokens or basic auth data may be sent to the redirect destination.
Executive priority
Treat this as a targeted credential leakage risk, not a confirmed widespread exploitation event. Prioritize review where Ktor clients call sensitive services with bearer tokens, API keys, or basic authentication and can follow redirects.
Technical view
CVE-2019-19703 affects Ktor through 1.2.6. The client resends HTTP Authorization header data to a redirect location, creating a credential disclosure risk during redirect handling. The source bundle provides no CVSS score, CWE, named fixed version, or confirmed exploitation evidence.
Likely exposure
Exposure is likely limited to applications using Ktor HTTP client through 1.2.6, sending Authorization headers, and allowing redirects that can reach another location. Systems that do not use Ktor client behavior or do not attach Authorization headers are less likely exposed.
Exploitation context
The provided sources do not show active exploitation and the CVE is not marked KEV. The practical risk depends on whether an attacker can influence redirect destinations or operate a redirect target that receives the forwarded Authorization header.
Researcher notes
The public record is sparse: description, affected version boundary, and one GitHub issue reference. There is no CVSS vector, CWE mapping, KEV listing, or exploit confirmation in the supplied bundle. Avoid expanding affected scope beyond Ktor through 1.2.6.
Mitigation direction
- Inventory applications using Ktor HTTP client through 1.2.6.
- Check Ktor vendor guidance and release notes for the corrected version.
- Upgrade affected Ktor dependencies when a vendor-supported fixed version is confirmed.
- Avoid forwarding Authorization headers across redirects to different origins.
- Restrict or validate redirect destinations for authenticated outbound requests.
Validation and detection
- Search dependency manifests for Ktor versions through 1.2.6.
- Identify code paths that send Authorization headers with Ktor clients.
- Review redirect-following configuration for authenticated outbound requests.
- Test that Authorization headers are not sent to cross-origin redirect targets.
- Confirm upgraded builds no longer use affected Ktor versions.
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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CVE-2019-19703 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/ktorio/ktor/issues/1467CVE 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.