CVE-2020-18158: Cross Site Scripting (XSS) vulnerability in HuCart 5.7.4 via nickname in index.php.

Routine

MEDIUM 5.4DOWNGRADE

CVE-2020-18158 is a medium-severity flaw (CVSS 5.4) affecting hucart. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in HuCart 5.7.4 via nickname in index.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hucart

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

Am I affected?

Timeline

2021-07-30 14:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

hucart hucart DOWNGRADE

Affected: 5.7.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.7.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.7.4 (Debian / Ubuntu)

apt-cache madison hucart sudo apt install hucart=<VERSION_BEFORE_5.7.4> sudo apt-mark hold hucart

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

dnf --showduplicates list hucart sudo dnf downgrade hucart-<VERSION_BEFORE_5.7.4> sudo dnf versionlock add hucart

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-2020-18158?

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

Is CVE-2020-18158 being exploited?

CVE-2020-18158 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-2020-18158 affect?

CVE-2020-18158 affects hucart. Severity is medium (CVSS 5.4). Cross Site Scripting (XSS) vulnerability in HuCart 5.7.4 via nickname in index.php.

How urgent is CVE-2020-18158?

Priority 36/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-18477 HIGH 8.8 DOWNGRADE SQL Injection vulnerability in Hucart CMS 5.7.4 via the purchase enquiry field found in the Message con_conten
CVE-2020-18476 HIGH 8.8 DOWNGRADE SQL Injection vulnerability in Hucart CMS 5.7.4 via the basic information field found in the avatar usd_image
CVE-2020-18475 MEDIUM 5.4 DOWNGRADE Cross Site Scripting (XSS) vulnerabilty exists in Hucart CMS 5.7.4 is via the mes_title field

References

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