CVE-2018-14040: In Bootstrap before 4.1.2, XSS is possible in the collapse data-parent attribute.

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MEDIUM 6.1WATCHLISTMITIGATEUPGRADE

CVE-2018-14040 is a medium-severity flaw (CVSS 6.1) affecting debian linux, bootstrap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Bootstrap before 4.1.2, XSS is possible in the collapse data-parent attribute.

Why this priority

EPSS top 9%: very likely to be exploited
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-07-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · getbootstrap

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-07-13 14:29 UTCPublished CVE record published
2026-06-17 01:40 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

getbootstrap bootstrap UPGRADE

Affected: < 3.4.0 · >= 4.0.0 and < 4.1.2 · 4.0.0 alpha · 4.0.0 alpha2 · 4.0.0 alpha3 · 4.0.0 alpha4 · 4.0.0 alpha5 · 4.0.0 alpha6

Fixed in: 3.4.0, 4.1.2

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy bootstrap || rpm -q bootstrap || bootstrap --version

2. UPGRADE to 3.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bootstrap

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bootstrap

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison bootstrap sudo apt install bootstrap=<VERSION_BEFORE_4.0.0> sudo apt-mark hold bootstrap

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bootstrap sudo dnf downgrade bootstrap-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add bootstrap

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-14040?

debian linux: mitigate or apply the listed mitigation; bootstrap: upgrade to 3.4.0, 4.1.2. Exact commands for each OS are on this page.

Is CVE-2018-14040 being exploited?

CVE-2018-14040 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-14040 affect?

CVE-2018-14040 affects debian linux, bootstrap. Severity is medium (CVSS 6.1). In Bootstrap before 4.1.2, XSS is possible in the collapse data-parent attribute.

How urgent is CVE-2018-14040?

Priority 54/100. EPSS top 9%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities · Bootstrap vulnerabilities

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References

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