CVE-2020-20092: File Upload vulnerability exists in ArticleCMS 1.0 via the image upload feature at /admin by changing the Cont

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-20092 is a critical-severity flaw (CVSS 9.8) affecting articlecms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

File Upload vulnerability exists in ArticleCMS 1.0 via the image upload feature at /admin by changing the Content-Type to image/jpeg and placing PHP code after the JPEG data, which could let a remote malicious user execute arbitrary PHP code.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-05-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: articlecms project

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

Am I affected?

Timeline

2021-05-13 15:15 UTCPublished CVE record published
2026-06-17 03:02 UTCUpdated Record last modified

articlecms project articlecms DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison articlecms sudo apt install articlecms=<VERSION_BEFORE_1.0> sudo apt-mark hold articlecms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list articlecms sudo dnf downgrade articlecms-<VERSION_BEFORE_1.0> sudo dnf versionlock add articlecms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-20092?

articlecms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-20092 being exploited?

CVE-2020-20092 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-2020-20092 affect?

CVE-2020-20092 affects articlecms. Severity is critical (CVSS 9.8). File Upload vulnerability exists in ArticleCMS 1.0 via the image upload feature at /admin by changing the Content-Type to image/jpeg and placing PHP code after the JPEG data, which could let a remote malicious user execute arbitrary PHP cod

How urgent is CVE-2020-20092?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-28063 CRITICAL 9.8 MITIGATE A file upload issue exists in all versions of ArticleCMS which allows malicious users to getshell.
CVE-2018-19469 MEDIUM 6.1 UPGRADE ArticleCMS through 2017-02-19 has XSS via the /update_personal_infomation realname or email parameter.
CVE-2018-12339 MEDIUM 5.4 UPGRADE ArticleCMS through 2017-02-19 has XSS via an "add an article" action.

References

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