CVE-2021-47783: Phpwcms 1.9.30 contains a file upload vulnerability that allows authenticated attackers to upload malicious SV

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-47783 is a medium-severity flaw (CVSS 5.4) affecting phpwcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Phpwcms 1.9.30 contains a file upload vulnerability that allows authenticated attackers to upload malicious SVG files with embedded JavaScript. Attackers can upload crafted SVG payloads through the multiple file upload feature to potentially execute cross-site scripting attacks on the platform.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: phpwcms

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

Am I affected?

Timeline

2026-01-16 00:16 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

phpwcms phpwcms DOWNGRADE

Affected: 1.9.30

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.9.30

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.9.30 (Debian / Ubuntu)

apt-cache madison phpwcms sudo apt install phpwcms=<VERSION_BEFORE_1.9.30> sudo apt-mark hold phpwcms

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

dnf --showduplicates list phpwcms sudo dnf downgrade phpwcms-<VERSION_BEFORE_1.9.30> sudo dnf versionlock add phpwcms

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-2021-47783?

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

Is CVE-2021-47783 being exploited?

CVE-2021-47783 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-2021-47783 affect?

CVE-2021-47783 affects phpwcms. Severity is medium (CVSS 5.4). Phpwcms 1.9.30 contains a file upload vulnerability that allows authenticated attackers to upload malicious SVG files with embedded JavaScript. Attackers can upload crafted SVG payloads through the multiple file upload feature to potentiall

How urgent is CVE-2021-47783?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2025-5499 HIGH 7.3 UPGRADE A vulnerability classified as critical has been found in slackero phpwcms up to 1.9.45/1.10.8
CVE-2025-5498 MEDIUM 5.5 UPGRADE A vulnerability was found in slackero phpwcms up to 1.9.45/1.10.8
CVE-2025-5497 MEDIUM 6.3 UPGRADE A vulnerability was detected in slackero phpwcms up to 1.9.45/1.10.8

References

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