CVE-2020-29455: A cross-Site Scripting (XSS) vulnerability in this.showInvalid and this.showInvalidCountry in SmartyStreets li

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MEDIUM 6.1DOWNGRADE

CVE-2020-29455 is a medium-severity flaw (CVSS 6.1) affecting liveaddressplugin.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-Site Scripting (XSS) vulnerability in this.showInvalid and this.showInvalidCountry in SmartyStreets liveAddressPlugin.js 3.2 allows remote attackers to inject arbitrary web script or HTML via any address parameter (e.g., street or country).

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-12-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: smartystreets

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

Am I affected?

Timeline

2020-12-11 20:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

smartystreets liveaddressplugin.js DOWNGRADE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

1. Check installed version

apt-cache policy liveaddressplugin.js || rpm -q liveaddressplugin.js || liveaddressplugin.js --version

2. No fixed release: DOWNGRADE to a release before 3.2 (Debian / Ubuntu)

apt-cache madison liveaddressplugin.js sudo apt install liveaddressplugin.js=<VERSION_BEFORE_3.2> sudo apt-mark hold liveaddressplugin.js

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list liveaddressplugin.js sudo dnf downgrade liveaddressplugin.js-<VERSION_BEFORE_3.2> sudo dnf versionlock add liveaddressplugin.js

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-2020-29455?

liveaddressplugin.js: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-29455 being exploited?

CVE-2020-29455 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-2020-29455 affect?

CVE-2020-29455 affects liveaddressplugin.js. Severity is medium (CVSS 6.1). A cross-Site Scripting (XSS) vulnerability in this.showInvalid and this.showInvalidCountry in SmartyStreets liveAddressPlugin.js 3.2 allows remote attackers to inject arbitrary web script or HTML via any address parameter (e.g., street or c

How urgent is CVE-2020-29455?

Priority 43/100. Public exploit reference

References

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