How severe is CVE-2026-5539?

CVE-2026-5539 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-5539 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5539?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5539 have an EU (EUVD) identifier?

Yes. CVE-2026-5539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19026.

When was CVE-2026-5539 published?

CVE-2026-5539 was published on 2026-04-05 and last updated on 2026-06-17.

CVE-2026-5539

CVE-2026-5539 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 5.0
CVSS v4: 2.1
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19026
Weakness: CWE-79
Published: 2026-04-05
Last modified: 2026-06-17

Description

A flaw has been found in code-projects Simple Laundry System 1.0. This affects an unknown part of the file /modifymember.php of the component Parameter Handler. This manipulation of the argument firstName causes cross site scripting. The attack can be initiated remotely. The exploit has been published and may be used.

Frequently asked questions

What is CVE-2026-5539?: A flaw has been found in code-projects Simple Laundry System 1.0. This affects an unknown part of the file /modifymember.php of the component Parameter Handler. This manipulation of the argument firstName causes cross site scripting. The attack can be initiated remotely. The exploit has been published and may be used.
How severe is CVE-2026-5539?: CVE-2026-5539 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-5539 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-5539?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5539 have an EU (EUVD) identifier?: Yes. CVE-2026-5539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19026.
When was CVE-2026-5539 published?: CVE-2026-5539 was published on 2026-04-05 and last updated on 2026-06-17.

References

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

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CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

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