How severe is CVE-2024-30503?

CVE-2024-30503 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2024-30503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-30503?

CVE-2024-30503 affects Mailster. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-30503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-30503 have an EU (EUVD) identifier?

Yes. CVE-2024-30503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-28423.

When was CVE-2024-30503 published?

CVE-2024-30503 was published on 2024-03-29 and last updated on 2026-06-17.

CVE-2024-30503

CVE-2024-30503 is a high-severity vulnerability in Mailster with a CVSS 3.x base score of 7.1. 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: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-28423
Weakness: CWE-79
Affected product: Mailster
Published: 2024-03-29
Last modified: 2026-06-17

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress Mailster mailster.This issue affects Mailster: from n/a through <= 4.0.6.

Frequently asked questions

What is CVE-2024-30503?: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress Mailster mailster.This issue affects Mailster: from n/a through <= 4.0.6.
How severe is CVE-2024-30503?: CVE-2024-30503 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2024-30503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-30503?: CVE-2024-30503 affects Mailster. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-30503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-30503 have an EU (EUVD) identifier?: Yes. CVE-2024-30503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-28423.
When was CVE-2024-30503 published?: CVE-2024-30503 was published on 2024-03-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mailster:mailster:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Mailster

CVE-2024-37433 — High (CVSS 7.1): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress…

All CVEs affecting Mailster →

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

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
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…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →