CVE-2020-9447: There is an XSS (cross-site scripting) vulnerability in GwtUpload 1.0.3 in the file upload functionality

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MEDIUM 6.1DOWNGRADE

CVE-2020-9447 is a medium-severity flaw (CVSS 6.1) affecting gwtupload. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is an XSS (cross-site scripting) vulnerability in GwtUpload 1.0.3 in the file upload functionality. Someone can upload a file with a malicious filename, which contains JavaScript code, which would result in XSS. Cross-site scripting enables attackers to steal data, change the appearance of a website, and perform other malicious activities like phishing or drive-by hacking.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-02-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gwtupload project

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

Am I affected?

Timeline

2020-02-28 16:15 UTCPublished CVE record published
2026-06-17 03:27 UTCUpdated Record last modified

gwtupload project gwtupload DOWNGRADE

Affected: 1.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.3 (Debian / Ubuntu)

apt-cache madison gwtupload sudo apt install gwtupload=<VERSION_BEFORE_1.0.3> sudo apt-mark hold gwtupload

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

dnf --showduplicates list gwtupload sudo dnf downgrade gwtupload-<VERSION_BEFORE_1.0.3> sudo dnf versionlock add gwtupload

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-2020-9447?

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

Is CVE-2020-9447 being exploited?

CVE-2020-9447 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-2020-9447 affect?

CVE-2020-9447 affects gwtupload. Severity is medium (CVSS 6.1). There is an XSS (cross-site scripting) vulnerability in GwtUpload 1.0.3 in the file upload functionality. Someone can upload a file with a malicious filename, which contains JavaScript code, which would result in XSS. Cross-site scripting e

How urgent is CVE-2020-9447?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2020-13128 HIGH 7.5 DOWNGRADE An issue was discovered in Manolo GWTUpload 1.0.3

References

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