CVE-2025-22303: Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster wp-mailster allows Re

Q: How do I fix CVE-2025-22303?

wp mailster: upgrade to 1.8.18. Exact commands for each OS are on this page.

Q: Is CVE-2025-22303 being exploited?

CVE-2025-22303 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-2025-22303 affect?

CVE-2025-22303 affects wp mailster. Severity is medium (CVSS 5.3). Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster wp-mailster allows Retrieve Embedded Sensitive Data.This issue affects WP Mailster: from n/a through <= 1.8.17.0.

Q: How urgent is CVE-2025-22303?

Priority 33/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2025-22303 is a medium-severity flaw (CVSS 5.3) affecting wp mailster. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster wp-mailster allows Retrieve Embedded Sensitive Data.This issue affects WP Mailster: from n/a through <= 1.8.17.0.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-201
Published	2025-01-07
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: wpmailster

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

Am I affected?

Timeline

2025-01-07 11:15 UTCPublished CVE record published
2026-06-17 08:46 UTCUpdated Record last modified

wpmailster wp mailster UPGRADE

Affected: < 1.8.18

Fixed in: 1.8.18

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.8.18 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wp-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-2025-22303?

wp mailster: upgrade to 1.8.18. Exact commands for each OS are on this page.

Is CVE-2025-22303 being exploited?

CVE-2025-22303 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-2025-22303 affect?

CVE-2025-22303 affects wp mailster. Severity is medium (CVSS 5.3). Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster wp-mailster allows Retrieve Embedded Sensitive Data.This issue affects WP Mailster: from n/a through <= 1.8.17.0.

How urgent is CVE-2025-22303?

Priority 33/100. Remotely exploitable, no login, no user action

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References

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