CVE-2017-18239 json
Exposure of Sensitive information in authentikat-jwt
published 2018-03-18 8 y ago modified 2026-06-17 4 mo ago also GHSA-3rhm-67j6-42jq , EUVD-2018-0729
- cvss
- 9.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.0%
- EPSS 2.0% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.
Patch / fix
- maven com.jason-goodwin:authentikat-jwt_2.12 0.4.6
Exploit prediction
1.96% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| GitHub | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | com.jason-goodwin:authentikat-jwt_2.12 | <0.4.6 |
0.4.6 |
References
-
github.com
/jasongoodwin/authentikat-jwt/commit/2d2fa0d40ac8f2f7aa7e9b070fa1a25eee082cb0
web, patch, third-party-advisory
-
github.com
/jasongoodwin/authentikat-jwt/pull/36
web, issue-tracking, third-party-advisory
-
github.com
/jasongoodwin/authentikat-jwt/issues/12
web, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-18239
advisory
-
github.com
/advisories/GHSA-3rhm-67j6-42jq
advisory
-
github.com
/jasongoodwin/authentikat-jwt
package
Sources
- CVE List CVE-2017-18239
- GitHub Advisory GHSA-3rhm-67j6-42jq
- NVD CVE-2017-18239
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.