CVE-2018-20676: In Bootstrap before 3.4.0, XSS is possible in the tooltip data-viewport attribute.

Q: How do I fix CVE-2018-20676?

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

Q: Is CVE-2018-20676 being exploited?

CVE-2018-20676 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-2018-20676 affect?

CVE-2018-20676 affects bootstrap. Severity is medium (CVSS 6.1). In Bootstrap before 3.4.0, XSS is possible in the tooltip data-viewport attribute.

Q: How urgent is CVE-2018-20676?

Priority 44/100. EPSS top 10%: very likely to be exploited

This month

MEDIUM 6.1UPGRADE

CVE-2018-20676 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 tooltip data-viewport attribute.

Why this priority

EPSS top 10%: very likely to be exploited

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	3.8% (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-2018-20676?

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

Is CVE-2018-20676 being exploited?

CVE-2018-20676 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-2018-20676 affect?

CVE-2018-20676 affects bootstrap. Severity is medium (CVSS 6.1). In Bootstrap before 3.4.0, XSS is possible in the tooltip data-viewport attribute.

How urgent is CVE-2018-20676?

Priority 44/100. EPSS top 10%: very likely to be exploited

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-2018-20677 MEDIUM 6.1 UPGRADE In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.
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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