CVE-2024-30503: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPres

Q: How do I fix CVE-2024-30503?

mailster: upgrade to 4.0.7. Exact commands for each OS are on this page.

Q: Is CVE-2024-30503 being exploited?

CVE-2024-30503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-30503 affect?

CVE-2024-30503 affects mailster. Severity is high (CVSS 7.1). 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.

Routine

HIGH 7.1UPGRADE

CVE-2024-30503 is a high-severity flaw (CVSS 7.1) affecting mailster. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-03-29
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: mailster

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

Am I affected?

Timeline

2024-03-29 13:15 UTCPublished CVE record published
2026-06-17 07:27 UTCUpdated Record last modified

mailster mailster UPGRADE

Affected: < 4.0.7

Fixed in: 4.0.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailster || rpm -q mailster || mailster --version

2. UPGRADE to 4.0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailster

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailster

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2024-30503?

mailster: upgrade to 4.0.7. Exact commands for each OS are on this page.

Is CVE-2024-30503 being exploited?

CVE-2024-30503 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-2024-30503 affect?

CVE-2024-30503 affects mailster. Severity is high (CVSS 7.1). 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 urgent is CVE-2024-30503?

Priority 34/100. High severity

Related CVEs

CVE-2024-37433 HIGH 7.1 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPres

References

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