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Vulnerability record · CVE-2018-11627 · published 31 May 2018

CVE-2018-11627: Sinatrarb sinatra cross-site scripting vulnerability

Sinatrarb · Sinatra

Sinatra before 2.0.2 has XSS via the 400 Bad Request page that occurs upon a params parser exception.

6.1 CVSS 3.0 Medium EPSS 2.2% · top 18.2% CWE-79 · Cross-site scripting
6.1CVSS 3.0 base score, v2 4.3
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Sinatra before 2.0.2 has XSS via the 400 Bad Request page that occurs upon a params parser exception.

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2019:0212 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0315 Third Party Advisory
https://github.com/sinatra/sinatra/commit/12786867d6faaceaec62c7c2cb5b0e2dc074d71a PatchThird Party Advisory
https://github.com/sinatra/sinatra/issues/1428 ExploitThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:0212 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0315 Third Party Advisory
https://github.com/sinatra/sinatra/commit/12786867d6faaceaec62c7c2cb5b0e2dc074d71a PatchThird Party Advisory
https://github.com/sinatra/sinatra/issues/1428 ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-11627), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.