CVE-2020-11561: In NCH Express Invoice 7.25, an authenticated low-privilege user can enter a crafted URL to access higher-priv

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HIGH 8.8DOWNGRADE

CVE-2020-11561 is a high-severity flaw (CVSS 8.8) affecting express invoice. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In NCH Express Invoice 7.25, an authenticated low-privilege user can enter a crafted URL to access higher-privileged functionalities such as the "Add New Item" screen.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-425
Published	2020-04-07
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

2020-04-07 16:15 UTCPublished CVE record published
2026-06-17 02:50 UTCUpdated Record last modified

nchsoftware express invoice DOWNGRADE

Affected: 7.25

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.25

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.25 (Debian / Ubuntu)

apt-cache madison express-invoice sudo apt install express-invoice=<VERSION_BEFORE_7.25> sudo apt-mark hold express-invoice

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

dnf --showduplicates list express-invoice sudo dnf downgrade express-invoice-<VERSION_BEFORE_7.25> 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-2020-11561?

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

Is CVE-2020-11561 being exploited?

CVE-2020-11561 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-2020-11561 affect?

CVE-2020-11561 affects express invoice. Severity is high (CVSS 8.8). In NCH Express Invoice 7.25, an authenticated low-privilege user can enter a crafted URL to access higher-privileged functionalities such as the "Add New Item" screen.

How urgent is CVE-2020-11561?

Priority 56/100. High severity; Public exploit reference

Related CVEs

CVE-2020-13476 MEDIUM 4.8 UPGRADE NCH Express Invoice 8.06 to 8.24 is vulnerable to Reflected XSS in the Quotes List module.
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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