Is CVE-2015-1840 in the CISA KEV catalog?

No. CVE-2015-1840 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-1840?

CVE-2015-1840 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2015-1840?

CVE-2015-1840 has an EPSS score of 4.40% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-1840?

Upgrade ruby-jquery-rails on debian 11 to 4.0.4-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-1840

MEDIUMEPSS 90th pctl

5.0

CVSS v2

NVD

Description

jquery_ujs.js in jquery-rails before 3.1.3 and 4.x before 4.0.4 and rails.js in jquery-ujs before 1.0.4, as used with Ruby on Rails 3.x and 4.x, allow remote attackers to bypass the Same Origin Policy, and trigger transmission of a CSRF token to a different-domain web server, via a leading space character in a URL within an attribute value.

CWE-200Information Exposure

How to fix

Remediation Available

ruby-jquery-railsDebian

Fixed in:4.0.4-1CVE-2015-1840

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.40%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Exploit1

groups.google.com

Vendor Advisory2

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.