CVE-2019-16676: Plataformatec Simple Form has Incorrect Access Control in file_method? in lib/simple_form/form_builder.rb, bec

Q: How do I fix CVE-2019-16676?

simple form: upgrade to 5.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-16676 being exploited?

CVE-2019-16676 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-16676 affect?

CVE-2019-16676 affects simple form. Severity is critical (CVSS 9.8). Plataformatec Simple Form has Incorrect Access Control in file_method? in lib/simple_form/form_builder.rb, because a user-supplied string is invoked as a method call.

Q: How urgent is CVE-2019-16676?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-16676 is a critical-severity flaw (CVSS 9.8) affecting simple form. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Plataformatec Simple Form has Incorrect Access Control in file_method? in lib/simple_form/form_builder.rb, because a user-supplied string is invoked as a method call.

Why this priority

Critical severity
Public exploit reference
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	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-09-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: plataformatec

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

Am I affected?

Timeline

2019-09-30 12:15 UTCPublished CVE record published
2026-06-17 02:22 UTCUpdated Record last modified

plataformatec simple form UPGRADE

Affected: < 5.0

Fixed in: 5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simple-form || rpm -q simple-form || simple-form --version

2. UPGRADE to 5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-form

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-form

Note

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

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-2019-16676?

simple form: upgrade to 5.0. Exact commands for each OS are on this page.

Is CVE-2019-16676 being exploited?

CVE-2019-16676 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-2019-16676 affect?

CVE-2019-16676 affects simple form. Severity is critical (CVSS 9.8). Plataformatec Simple Form has Incorrect Access Control in file_method? in lib/simple_form/form_builder.rb, because a user-supplied string is invoked as a method call.

How urgent is CVE-2019-16676?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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