CVE-2020-13476: NCH Express Invoice 8.06 to 8.24 is vulnerable to Reflected XSS in the Quotes List module.

Routine

MEDIUM 4.8UPGRADE

CVE-2020-13476 is a medium-severity flaw (CVSS 4.8) affecting express invoice. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NCH Express Invoice 8.06 to 8.24 is vulnerable to Reflected XSS in the Quotes List module.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-12-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nchsoftware

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

Am I affected?

Timeline

2020-12-28 22:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

nchsoftware express invoice UPGRADE

Affected: >= 8.06 and <= 8.24

Fixed in: newer than 8.24

Safe to downgrade to: a release before 8.06

1. Check installed version

apt-cache policy express-invoice || rpm -q express-invoice || express-invoice --version

2. UPGRADE to newer than 8.24 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade express-invoice

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade express-invoice

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.06 (Debian / Ubuntu)

apt-cache madison express-invoice sudo apt install express-invoice=<VERSION_BEFORE_8.06> sudo apt-mark hold express-invoice

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list express-invoice sudo dnf downgrade express-invoice-<VERSION_BEFORE_8.06> sudo dnf versionlock add express-invoice

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-2020-13476?

express invoice: upgrade to newer than 8.24. Exact commands for each OS are on this page.

Is CVE-2020-13476 being exploited?

CVE-2020-13476 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-2020-13476 affect?

CVE-2020-13476 affects express invoice. Severity is medium (CVSS 4.8). NCH Express Invoice 8.06 to 8.24 is vulnerable to Reflected XSS in the Quotes List module.

How urgent is CVE-2020-13476?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2020-11561 HIGH 8.8 DOWNGRADE In NCH Express Invoice 7.25, an authenticated low-privilege user can enter a crafted URL to access higher-priv
CVE-2020-11560 HIGH 7.8 DOWNGRADE NCH Express Invoice 7.25 allows local users to discover the cleartext password by reading the configuration fi
CVE-2019-16282 MEDIUM 5.4 DOWNGRADE In NCH Express Invoice v7.12, persistent cross site scripting (XSS) exists via the Invoices/Items/Customers/Qu

References

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