CVE-2021-41467: Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below

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MEDIUM 6.1DOWNGRADE

CVE-2021-41467 is a medium-severity flaw (CVSS 6.1) affecting justwriting. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.

Why this priority

No elevated risk signals yet

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	3.6% (top 11%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-10-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: justwriting project

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

Am I affected?

Timeline

2021-10-01 16:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

justwriting project justwriting DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison justwriting sudo apt install justwriting=<VERSION_BEFORE_1.0.0> sudo apt-mark hold justwriting

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

dnf --showduplicates list justwriting sudo dnf downgrade justwriting-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add justwriting

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.

Public exploits and detection

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

Nuclei scan template: JustWriting - 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-2021-41467?

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

Is CVE-2021-41467 being exploited?

CVE-2021-41467 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-2021-41467 affect?

CVE-2021-41467 affects justwriting. Severity is medium (CVSS 6.1). Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.

How urgent is CVE-2021-41467?

Priority 44/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities · Dropbox vulnerabilities

References

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