CVE-2026-26746: OpenSourcePOS 3.4.1 contains a Local File Inclusion (LFI) vulnerability in the Sales.php::getInvoice() functio

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HIGH 8.8DOWNGRADE

CVE-2026-26746 is a high-severity flaw (CVSS 8.8) affecting open source point of sale. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenSourcePOS 3.4.1 contains a Local File Inclusion (LFI) vulnerability in the Sales.php::getInvoice() function. An attacker can read arbitrary files on the web server by manipulating the Invoice Type configuration. This issue can be chained with the file upload functionality to achieve Remote Code Execution (RCE).

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	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-02-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: opensourcepos

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

Am I affected?

Timeline

2026-02-20 17:25 UTCPublished CVE record published
2026-06-17 10:26 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-2026-26746?

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

Is CVE-2026-26746 being exploited?

CVE-2026-26746 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-2026-26746 affect?

CVE-2026-26746 affects open source point of sale. Severity is high (CVSS 8.8). OpenSourcePOS 3.4.1 contains a Local File Inclusion (LFI) vulnerability in the Sales.php::getInvoice() function. An attacker can read arbitrary files on the web server by manipulating the Invoice Type configuration. This issue can be chaine

How urgent is CVE-2026-26746?

Priority 49/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

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CVE-2026-26745 MEDIUM 5.3 DOWNGRADE OpenSourcePOS 3.4.1 has a second order SQL Injection vulnerability in the handling of the currency_symbol conf

References

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