CVE-2026-30556: A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-30556 is a medium-severity flaw (CVSS 6.1) affecting sales and inventory system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0. The vulnerability is located in the index.php file via the "msg" parameter. The application fails to sanitize the input, allowing remote attackers to inject arbitrary web script or HTML via a crafted URL.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ahsanriaz26gmailcom

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

Am I affected?

Timeline

2026-03-30 16:16 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

ahsanriaz26gmailcom sales and inventory system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy sales-and-inventory-system || rpm -q sales-and-inventory-system || sales-and-inventory-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison sales-and-inventory-system sudo apt install sales-and-inventory-system=<VERSION_BEFORE_1.0> sudo apt-mark hold sales-and-inventory-system

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

dnf --showduplicates list sales-and-inventory-system sudo dnf downgrade sales-and-inventory-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add sales-and-inventory-system

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-2026-30556?

sales and inventory system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-30556 being exploited?

CVE-2026-30556 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-2026-30556 affect?

CVE-2026-30556 affects sales and inventory system. Severity is medium (CVSS 6.1). A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0. The vulnerability is located in the index.php file via the "msg" parameter. The application fails to sanitize the input, allowing

How urgent is CVE-2026-30556?

Priority 31/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-4826 MEDIUM 6.3 DOWNGRADE A vulnerability was determined in SourceCodester Sales and Inventory System 1.0
CVE-2026-4825 MEDIUM 6.3 DOWNGRADE A vulnerability was found in SourceCodester Sales and Inventory System 1.0
CVE-2026-4781 MEDIUM 6.3 DOWNGRADE A flaw has been found in SourceCodester Sales and Inventory System 1.0
CVE-2026-4780 MEDIUM 6.3 DOWNGRADE A vulnerability was detected in SourceCodester Sales and Inventory System 1.0
CVE-2026-4779 MEDIUM 6.3 DOWNGRADE A security vulnerability has been detected in SourceCodester Sales and Inventory System 1.0

References

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