CVE-2019-16699: The sr_freecap (aka freeCap CAPTCHA) extension 2.4.5 and below and 2.5.2 and below for TYPO3 fails to sanitize

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-16699 is a critical-severity flaw (CVSS 9.8) affecting sr freecap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The sr_freecap (aka freeCap CAPTCHA) extension 2.4.5 and below and 2.5.2 and below for TYPO3 fails to sanitize user input, which allows execution of arbitrary Extbase actions, resulting in Remote Code Execution.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-10-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sr freecap project

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

Am I affected?

Timeline

2019-10-16 19:15 UTCPublished CVE record published
2026-06-17 02:22 UTCUpdated Record last modified

sr freecap project sr freecap UPGRADE

Affected: >= 2.4.0 and <= 2.4.5 · >= 2.5.0 and <= 2.5.2

Fixed in: newer than 2.5.2

Safe to downgrade to: a release before 2.4.0

1. Check installed version

apt-cache policy sr-freecap || rpm -q sr-freecap || sr-freecap --version

2. UPGRADE to newer than 2.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sr-freecap

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sr-freecap

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 2.4.0 (Debian / Ubuntu)

apt-cache madison sr-freecap sudo apt install sr-freecap=<VERSION_BEFORE_2.4.0> sudo apt-mark hold sr-freecap

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

dnf --showduplicates list sr-freecap sudo dnf downgrade sr-freecap-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add sr-freecap

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-2019-16699?

sr freecap: upgrade to newer than 2.5.2. Exact commands for each OS are on this page.

Is CVE-2019-16699 being exploited?

CVE-2019-16699 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-2019-16699 affect?

CVE-2019-16699 affects sr freecap. Severity is critical (CVSS 9.8). The sr_freecap (aka freeCap CAPTCHA) extension 2.4.5 and below and 2.5.2 and below for TYPO3 fails to sanitize user input, which allows execution of arbitrary Extbase actions, resulting in Remote Code Execution.

How urgent is CVE-2019-16699?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

TYPO3 vulnerabilities

References

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