How severe is CVE-2015-1840?

CVE-2015-1840 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-1840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-1840?

CVE-2015-1840 primarily affects Rubyonrails Jquery-rails. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-1840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-1840 published?

CVE-2015-1840 was published on 2015-07-26 and last updated on 2026-06-17.

CVE-2015-1840

CVE-2015-1840 is a medium-severity vulnerability in Rubyonrails Jquery-rails with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Rubyonrails Jquery-rails
Published: 2015-07-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2015-1840?: 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.
How severe is CVE-2015-1840?: CVE-2015-1840 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-1840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-1840?: CVE-2015-1840 primarily affects Rubyonrails Jquery-rails. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-1840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-1840 published?: CVE-2015-1840 was published on 2015-07-26 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:jquery-rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:jquery-rails:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:jquery-rails:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:jquery-ujs:*:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

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