CVE-2019-11887: SimplyBook.me through 2019-05-11 does not properly restrict File Upload which could allow remote code executio

Q: How do I fix CVE-2019-11887?

simplybook: upgrade to newer than 2019-05-11. Exact commands for each OS are on this page.

Q: Is CVE-2019-11887 being exploited?

CVE-2019-11887 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-2019-11887 affect?

CVE-2019-11887 affects simplybook. Severity is critical (CVSS 9.8). SimplyBook.me through 2019-05-11 does not properly restrict File Upload which could allow remote code execution.

Q: How urgent is CVE-2019-11887?

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

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-11887 is a critical-severity flaw (CVSS 9.8) affecting simplybook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SimplyBook.me through 2019-05-11 does not properly restrict File Upload which could allow 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	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-434
Published	2019-05-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: simplybook

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

Am I affected?

Timeline

2019-05-17 17:29 UTCPublished CVE record published
2026-06-17 02:13 UTCUpdated Record last modified

simplybook simplybook UPGRADE

Affected: <= 2019-05-11

Fixed in: newer than 2019-05-11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2019-05-11 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simplybook

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-2019-11887?

simplybook: upgrade to newer than 2019-05-11. Exact commands for each OS are on this page.

Is CVE-2019-11887 being exploited?

CVE-2019-11887 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-2019-11887 affect?

CVE-2019-11887 affects simplybook. Severity is critical (CVSS 9.8). SimplyBook.me through 2019-05-11 does not properly restrict File Upload which could allow remote code execution.

How urgent is CVE-2019-11887?

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

Related CVEs

CVE-2019-11489 HIGH 8.8 UPGRADE Incorrect Access Control in the Administrative Management Interface in SimplyBook.me Enterprise before 2019-04
CVE-2019-11488 HIGH 8.1 UPGRADE Incorrect Access Control in the Account Access / Password Reset Link in SimplyBook.me Enterprise before 2019-0

References

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