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CVE-2019-10842

33
FAUCET Score

CVE-2019-10842 is a critical arbitrary code execution vulnerability affecting bootstrap-sass version 3.2.0.3 downloaded from rubygems.org. An unauthenticated attacker can exploit this by crafting a malicious ___cfduid cookie value containing base64 encoded arbitrary code, which is then executed via eval(). This vulnerability carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low complexity, and complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.2.0.3CPE matchmatch criteria
cpe:2.3:a:getbootstrap:bootstrap-sass:3.2.0.3:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.92%
Probability of exploitation in next 30 days
EPSS Percentile
91.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0492 is in the 85th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rubygemspatch availablevia ghsa
Product: bootstrap-sassFixed in: 3.2.0.4

Vendor Advisories (2)

rubygemsGHSA-vqqv-v9m2-48p2critical

Bootstrap-sass contains code execution backdoor

Apr 4, 2019
redhatCVE-2019-10842Important

rubygem-bootstrap-sass: backdoor code allows arbitrary code execution when downloaded from rubygems.org

Mar 27, 2019

References

dgb.github.io / 2019/04/05/bootstrap-sass-backdoor.html
Third Party Advisory
github.com / twbs/bootstrap-sass/issues/1195
Issue TrackingThird Party Advisory
snyk.io / blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem
ExploitThird Party Advisory
snyk.io / vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
ExploitThird Party Advisory