CVE-2019-19703
URL Redirection to Untrusted Site (Open Redirect) in Ktor
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
- Record
CVE-2019-19703- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
CVE List No score
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
- Record
CVE-2019-19703- Updated
- 2026-11-02
EUVDEUVD-2020-0322 No score
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
- Record
EUVD-2020-0322- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xwgq-pcqx-hpmv
URL Redirection to Untrusted Site (Open Redirect) in Ktor
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
- Record
GHSA-xwgq-pcqx-hpmv- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSV
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
- Record
CVE-2019-19703- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-xwgq-pcqx-hpmv
URL Redirection to Untrusted Site (Open Redirect) in Ktor
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
- Record
GHSA-xwgq-pcqx-hpmv- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
io.ktor:ktor-client-coreMaven |
through 1.2.6 | 1.3.0 |
io.ktor:ktor-client-coreMaven |
before 1.3.0, plus listed versions 1.0.01.0.0-rc1.0.11.1.01.1.1 Show 16 moreShow less1.1.21.1.31.1.41.1.51.2.01.2.0-rc1.2.0-rc21.2.11.2.21.2.31.2.3-rc1.2.41.2.51.2.61.3.0-rc1.3.0-rc2 |
1.3.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-19703 is a medium vulnerability (CVSS 6.1) in Jetbrains Ktor, published December 10, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.64%, the 51st percentile. Fixed in io.ktor:ktor-client-core 1.3.0.