CVE-2019-20203: The Authorized Addresses feature in the Postie plugin 1.9.40 for WordPress allows remote attackers to publish

Q: How do I fix CVE-2019-20203?

postie: upgrade to newer than 1.9.40. Exact commands for each OS are on this page.

Q: Is CVE-2019-20203 being exploited?

CVE-2019-20203 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-2019-20203 affect?

CVE-2019-20203 affects postie. Severity is medium (CVSS 5.3). The Authorized Addresses feature in the Postie plugin 1.9.40 for WordPress allows remote attackers to publish posts by spoofing the From information of an email message.

Q: How urgent is CVE-2019-20203?

Priority 49/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2019-20203 is a medium-severity flaw (CVSS 5.3) affecting postie. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Authorized Addresses feature in the Postie plugin 1.9.40 for WordPress allows remote attackers to publish posts by spoofing the From information of an email message.

Why this priority

Public exploit reference
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	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-290
Published	2020-01-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: postieplugin

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

Am I affected?

Timeline

2020-01-02 14:16 UTCPublished CVE record published
2026-06-17 02:30 UTCUpdated Record last modified

postieplugin postie UPGRADE

Affected: <= 1.9.40

Fixed in: newer than 1.9.40

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.9.40 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade postie

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-2019-20203?

postie: upgrade to newer than 1.9.40. Exact commands for each OS are on this page.

Is CVE-2019-20203 being exploited?

CVE-2019-20203 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-2019-20203 affect?

CVE-2019-20203 affects postie. Severity is medium (CVSS 5.3). The Authorized Addresses feature in the Postie plugin 1.9.40 for WordPress allows remote attackers to publish posts by spoofing the From information of an email message.

How urgent is CVE-2019-20203?

Priority 49/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2019-20204 MEDIUM 5.4 UPGRADE The Postie plugin 1.9.40 for WordPress allows XSS, as demonstrated by a certain payload with jaVasCript:/* at

References

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