CVE-2019-19703 json
URL Redirection to Untrusted Site (Open Redirect) in Ktor
published 2019-12-10 6 y ago modified 2026-06-17 4 mo ago also GHSA-xwgq-pcqx-hpmv , EUVD-2020-0322
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.
Patch / fix
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ktorio/ktor/issues/1467 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | io.ktor:ktor-client-core | <1.3.0 |
1.3.0 |
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/ktorio/ktor/commit/0c108156f45423d09014b47be810188629cb878f
web
-
github.com
/ktorio/ktor/issues/1467
web, exploit, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2019-19703
advisory
Sources
- CVE List CVE-2019-19703
- GitHub Advisory GHSA-xwgq-pcqx-hpmv
- NVD CVE-2019-19703
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.