CVE-2018-20677

MEDIUMNVD 6.1

6.1

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

CVSS v3: 6.1
EG Score: —
EPSS: 93.1%
KEV: Not listed

Published

January 9, 2019

Last Modified

November 21, 2024

References (28)

cve@mitrehttps://access.redhat.com/errata/RHBA-2019:1076
cve@mitrehttps://access.redhat.com/errata/RHBA-2019:1570
cve@mitrehttps://access.redhat.com/errata/RHSA-2019:1456
cve@mitrehttps://access.redhat.com/errata/RHSA-2019:3023
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0132
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0133
cve@mitrehttps://blog.getbootstrap.com/2018/12/13/bootstrap-3-4-0/
cve@mitrehttps://github.com/twbs/bootstrap/issues/27045
cve@mitrehttps://github.com/twbs/bootstrap/issues/27915#issuecomment-452140906
cve@mitrehttps://github.com/twbs/bootstrap/issues/27915#issuecomment-452196628
cve@mitrehttps://github.com/twbs/bootstrap/pull/27047
cve@mitrehttps://lists.apache.org/thread.html/52e0e6b5df827ee7f1e68f7cc3babe61af3b2160f5d74a85469b7b0e%40%3Cdev.superset.apache.org%3E
cve@mitrehttps://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
cve@mitrehttps://www.tenable.com/security/tns-2021-14
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHBA-2019:1076

Affected Packages

(7 across 5 ecosystems)

npm(2)

Package	Vulnerable range	Fixed in	Dependents
bootstrap	—	3.4.0	—
bootstrap-sass	—	3.4.0	—

RubyGems(2)

Package	Vulnerable range	Fixed in	Dependents
bootstrap	—	3.4.0	—
bootstrap-sass	1.2.0 ... 3.3.7 (57 versions)	3.4.0	—

Maven(1)

Package	Vulnerable range	Fixed in	Dependents
org.webjars:bootstrap	1.3.0 ... 3.3.7-1 (33 versions)	3.4.0	—

NuGet(1)

Package	Vulnerable range	Fixed in	Dependents
bootstrap	1.0.0 ... 3.3.7 (19 versions)	3.4.0	—

Packagist(1)

Package	Vulnerable range	Fixed in	Dependents
twbs/bootstrap	v2.2.2 ... v3.3.7 (20 versions)	3.4.0	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 3× in last 7d / 3× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:41 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-20677?

CVE-2018-20677 is a medium vulnerability published on January 9, 2019. In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.

When was CVE-2018-20677 disclosed?

CVE-2018-20677 was first published in the National Vulnerability Database on January 9, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-20677 actively exploited?

CVE-2018-20677 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-20677?

CVE-2018-20677 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2018-20677?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20677, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-20677

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CVE-2018-20677

📅 Published

🔄 Last Modified

🔗 References (28)

Affected Packages

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20677?

CVE-2018-20677

📅 Published

🔄 Last Modified

🔗 References (28)

Affected Packages

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20677?

Published

Last Modified

References (28)

Frequently asked(5)

Published

Last Modified

References (28)

Frequently asked(5)