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CRITICAL severity

CVE-2019-16699 — sr-freecap

CRITICAL

CVE-2019-16699 is a critical-severity (CVSS 9.8) Improper Input Validation vulnerability in sjbr/sr-freecap. A fix is available for sjbr/sr-freecap — see the affected versions and patch details below.

sr_freecap for Typo3 RCE Vulnerability

Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
1.93%2.28%2.63%2.98%2.5%2.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐘sjbr/sr-freecap🐘sjbr/sr-freecap

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsjbr/sr-freecap≥ 2.5.0&&< 2.5.32.5.3composer require sjbr/sr-freecap:^2.5.3
🐘Packagistsjbr/sr-freecapall versions2.4.6composer require sjbr/sr-freecap:^2.4.6

Affected Products

1 product · 2 configurations
Application
sr freecapsr_freecap_project
≥ 2.5.0 && ≤ 2.5.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sjbr/sr-freecap, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update sjbr/sr-freecap to 2.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-16699 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2019-16699: sr-freecap RCE — Fixed in 2.5.3