CVE-2019-12161: WPO WebPageTest 19.04 allows SSRF because ValidateURL in www/runtest.php does not consider octal encoding of I

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HIGH 8.8DOWNGRADE

CVE-2019-12161 is a high-severity flaw (CVSS 8.8) affecting webpagetest. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WPO WebPageTest 19.04 allows SSRF because ValidateURL in www/runtest.php does not consider octal encoding of IP addresses (such as 0300.0250 as a replacement for 192.168).

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-918
Published	2019-05-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: webpagetest

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 19:29 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

webpagetest webpagetest DOWNGRADE

Affected: 19.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.04

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 19.04 (Debian / Ubuntu)

apt-cache madison webpagetest sudo apt install webpagetest=<VERSION_BEFORE_19.04> sudo apt-mark hold webpagetest

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list webpagetest sudo dnf downgrade webpagetest-<VERSION_BEFORE_19.04> sudo dnf versionlock add webpagetest

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-2019-12161?

webpagetest: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-12161 being exploited?

CVE-2019-12161 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-2019-12161 affect?

CVE-2019-12161 affects webpagetest. Severity is high (CVSS 8.8). WPO WebPageTest 19.04 allows SSRF because ValidateURL in www/runtest.php does not consider octal encoding of IP addresses (such as 0300.0250 as a replacement for 192.168).

How urgent is CVE-2019-12161?

Priority 47/100. High severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2019-17199 HIGH 7.5 DOWNGRADE www/getfile.php in WPO WebPageTest 19.04 on Windows allows Directory Traversal (for reading arbitrary files) b

References

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