CVE-2021-31778: The media2click (aka 2 Clicks for External Media) extension 1.x before 1.3.3 for TYPO3 allows XSS by a backend

Routine

MEDIUM 5.4UPGRADE

CVE-2021-31778 is a medium-severity flaw (CVSS 5.4) affecting media2click. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The media2click (aka 2 Clicks for External Media) extension 1.x before 1.3.3 for TYPO3 allows XSS by a backend user account.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-04-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: media2click project

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

Am I affected?

Timeline

2021-04-28 07:15 UTCPublished CVE record published
2026-06-17 03:52 UTCUpdated Record last modified

media2click project media2click UPGRADE

Affected: >= 1.0.0 and < 1.3.3

Fixed in: 1.3.3

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy media2click || rpm -q media2click || media2click --version

2. UPGRADE to 1.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade media2click

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade media2click

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison media2click sudo apt install media2click=<VERSION_BEFORE_1.0.0> sudo apt-mark hold media2click

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list media2click sudo dnf downgrade media2click-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add media2click

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-2021-31778?

media2click: upgrade to 1.3.3. Exact commands for each OS are on this page.

Is CVE-2021-31778 being exploited?

CVE-2021-31778 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-2021-31778 affect?

CVE-2021-31778 affects media2click. Severity is medium (CVSS 5.4). The media2click (aka 2 Clicks for External Media) extension 1.x before 1.3.3 for TYPO3 allows XSS by a backend user account.

How urgent is CVE-2021-31778?

Priority 30/100. No elevated risk signals yet.

Software pages

TYPO3 vulnerabilities

References

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