CVE-2025-66921: A Cross-site scripting (XSS) vulnerability in Create/Update Item(s) Module in Open Source Point of Sale v3.4.1

This month

HIGH 7.2DOWNGRADE

CVE-2025-66921 is a high-severity flaw (CVSS 7.2) affecting open source point of sale. 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 Create/Update Item(s) Module in Open Source Point of Sale v3.4.1 allows remote attackers to inject arbitrary web script or HTML via the "name" parameter.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-20, CWE-79
Published	2025-12-17
Last modified	2026-10-13

Publisher (CNA): MITRE · Vendor: opensourcepos

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-17 17:15 UTCPublished CVE record published
2026-10-13 11:10 UTCUpdated Record last modified

opensourcepos open source point of sale DOWNGRADE

Affected: 3.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4.1

1. Check installed version

apt-cache policy open-source-point-of-sale || rpm -q open-source-point-of-sale || open-source-point-of-sale --version

2. No fixed release: DOWNGRADE to a release before 3.4.1 (Debian / Ubuntu)

apt-cache madison open-source-point-of-sale sudo apt install open-source-point-of-sale=<VERSION_BEFORE_3.4.1> sudo apt-mark hold open-source-point-of-sale

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

dnf --showduplicates list open-source-point-of-sale sudo dnf downgrade open-source-point-of-sale-<VERSION_BEFORE_3.4.1> sudo dnf versionlock add open-source-point-of-sale

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-2025-66921?

open source point of sale: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-66921 being exploited?

CVE-2025-66921 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-2025-66921 affect?

CVE-2025-66921 affects open source point of sale. Severity is high (CVSS 7.2). A Cross-site scripting (XSS) vulnerability in Create/Update Item(s) Module in Open Source Point of Sale v3.4.1 allows remote attackers to inject arbitrary web script or HTML via the "name" parameter.

How urgent is CVE-2025-66921?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2025-66923 HIGH 7.2 DOWNGRADE A Cross-site scripting (XSS) vulnerability in Create/Update Customer(s) in Open Source Point of Sale v3.4.1 al
CVE-2025-68147 HIGH 8.1 UPGRADE Open Source Point of Sale (opensourcepos) is a web based point of sale application written in PHP using CodeIg
CVE-2025-68434 HIGH 8.8 UPGRADE Open Source Point of Sale (opensourcepos) is a web based point of sale application written in PHP using CodeIg
CVE-2025-66924 MEDIUM 6.1 DOWNGRADE A Cross-site scripting (XSS) vulnerability in Create/Update Item Kit(s) in Open Source Point of Sale v3.4.1 al
CVE-2026-32712 MEDIUM 5.4 UPGRADE Open Source Point of Sale is a web based point-of-sale application written in PHP using CodeIgniter framework

References

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