CVE-2018-20677: In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.

Q: How do I fix CVE-2018-20677?

bootstrap: upgrade to 3.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-20677 being exploited?

CVE-2018-20677 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-20677 affect?

CVE-2018-20677 affects bootstrap. Severity is medium (CVSS 6.1). In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.

Q: How urgent is CVE-2018-20677?

Priority 49/100. EPSS top 10%: very likely to be exploited; Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2018-20677 is a medium-severity flaw (CVSS 6.1) affecting bootstrap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.

Why this priority

EPSS top 10%: very likely to be exploited
Public exploit reference

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	4.0% (top 10%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-01-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: getbootstrap

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

Am I affected?

Timeline

2019-01-09 05:29 UTCPublished CVE record published
2026-06-17 01:53 UTCUpdated Record last modified

getbootstrap bootstrap UPGRADE

Affected: < 3.4.0

Fixed in: 3.4.0

Safe to downgrade to: no unaffected older release

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.

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-2018-20677?

bootstrap: upgrade to 3.4.0. Exact commands for each OS are on this page.

Is CVE-2018-20677 being exploited?

CVE-2018-20677 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-2018-20677 affect?

CVE-2018-20677 affects bootstrap. Severity is medium (CVSS 6.1). In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.

How urgent is CVE-2018-20677?

Priority 49/100. EPSS top 10%: very likely to be exploited; Public exploit reference

Software pages

Bootstrap vulnerabilities

Related CVEs

CVE-2019-8331 MEDIUM 6.1 UPGRADE UPGRADE In Bootstrap before 3.4.1 and 4.3.x before 4.3.1, XSS is possible in the tooltip or popover data-template attr
CVE-2018-20676 MEDIUM 6.1 UPGRADE In Bootstrap before 3.4.0, XSS is possible in the tooltip data-viewport attribute.
CVE-2018-14042 MEDIUM 6.1 UPGRADE In Bootstrap before 4.1.2, XSS is possible in the data-container property of tooltip.
CVE-2018-14041 MEDIUM 6.1 UPGRADE In Bootstrap before 4.1.2, XSS is possible in the data-target property of scrollspy.
CVE-2018-14040 MEDIUM 6.1 MITIGATE UPGRADE In Bootstrap before 4.1.2, XSS is possible in the collapse data-parent attribute.

References

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