CVE-2019-3958: Insufficient output sanitization in WallacePOS 1.4.3 allows a remote, authenticated attacker to conduct persis

Routine

MEDIUM 5.4DOWNGRADE

CVE-2019-3958 is a medium-severity flaw (CVSS 5.4) affecting wallacepos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Insufficient output sanitization in WallacePOS 1.4.3 allows a remote, authenticated attacker to conduct persistent cross-site scripting (XSS) attacks via a crafted sales transaction.

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	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-07-31
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: wallaceit

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

Am I affected?

Timeline

2019-07-31 18:15 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

wallaceit wallacepos DOWNGRADE

Affected: 1.4.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4.3 (Debian / Ubuntu)

apt-cache madison wallacepos sudo apt install wallacepos=<VERSION_BEFORE_1.4.3> sudo apt-mark hold wallacepos

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

dnf --showduplicates list wallacepos sudo dnf downgrade wallacepos-<VERSION_BEFORE_1.4.3> sudo dnf versionlock add wallacepos

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-2019-3958?

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

Is CVE-2019-3958 being exploited?

CVE-2019-3958 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-2019-3958 affect?

CVE-2019-3958 affects wallacepos. Severity is medium (CVSS 5.4). Insufficient output sanitization in WallacePOS 1.4.3 allows a remote, authenticated attacker to conduct persistent cross-site scripting (XSS) attacks via a crafted sales transaction.

How urgent is CVE-2019-3958?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2019-3960 HIGH 7.2 DOWNGRADE Unrestricted upload of file with dangerous type in WallacePOS 1.4.3 allows a remote, authenticated attacker to
CVE-2019-3959 HIGH 8.8 DOWNGRADE Cross-site request forgery in WallacePOS 1.4.3 allows a remote attacker to perform sensitive application actio
CVE-2017-7388 MEDIUM 6.1 UPGRADE A Cross-Site Scripting (XSS) was discovered in 'wallacepos v1.4.1'

References

← Back to latest CVEs