CVE-2021-40813: A cross-site scripting (XSS) vulnerability in the "Zip content" feature in Element-IT HTTP Commander 3.1.9 all

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-40813 is a medium-severity flaw (CVSS 5.4) affecting http commander. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (XSS) vulnerability in the "Zip content" feature in Element-IT HTTP Commander 3.1.9 allows remote authenticated users to inject arbitrary web script or HTML via filenames.

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	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-01-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: element-it

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

Am I affected?

Timeline

2022-01-13 18:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

element-it http commander DOWNGRADE

Affected: 3.1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.9

1. Check installed version

apt-cache policy http-commander || rpm -q http-commander || http-commander --version

2. No fixed release: DOWNGRADE to a release before 3.1.9 (Debian / Ubuntu)

apt-cache madison http-commander sudo apt install http-commander=<VERSION_BEFORE_3.1.9> sudo apt-mark hold http-commander

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

dnf --showduplicates list http-commander sudo dnf downgrade http-commander-<VERSION_BEFORE_3.1.9> sudo dnf versionlock add http-commander

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-2021-40813?

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

Is CVE-2021-40813 being exploited?

CVE-2021-40813 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-2021-40813 affect?

CVE-2021-40813 affects http commander. Severity is medium (CVSS 5.4). A cross-site scripting (XSS) vulnerability in the "Zip content" feature in Element-IT HTTP Commander 3.1.9 allows remote authenticated users to inject arbitrary web script or HTML via filenames.

How urgent is CVE-2021-40813?

Priority 38/100. Public exploit reference

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References

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