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

Q: How do I fix CVE-2019-20204?

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

Q: Is CVE-2019-20204 being exploited?

CVE-2019-20204 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-2019-20204 affect?

CVE-2019-20204 affects postie. Severity is medium (CVSS 5.4). The Postie plugin 1.9.40 for WordPress allows XSS, as demonstrated by a certain payload with jaVasCript:/* at the beginning and a crafted SVG element.

Q: How urgent is CVE-2019-20204?

Priority 46/100. Public exploit reference

This month

MEDIUM 5.4UPGRADE

CVE-2019-20204 is a medium-severity flaw (CVSS 5.4) affecting postie. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Postie plugin 1.9.40 for WordPress allows XSS, as demonstrated by a certain payload with jaVasCript:/* at the beginning and a crafted SVG element.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-79
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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: WordPress Plugin Postie 1.9.40 - Persistent Cross-Site Scripting

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-2019-20204?

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

Is CVE-2019-20204 being exploited?

CVE-2019-20204 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-2019-20204 affect?

CVE-2019-20204 affects postie. Severity is medium (CVSS 5.4). The Postie plugin 1.9.40 for WordPress allows XSS, as demonstrated by a certain payload with jaVasCript:/* at the beginning and a crafted SVG element.

How urgent is CVE-2019-20204?

Priority 46/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2019-20203 MEDIUM 5.3 UPGRADE The Authorized Addresses feature in the Postie plugin 1.9.40 for WordPress allows remote attackers to publish

References

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