CVE-2018-19784: The str_rot_pass function in vendor/atholn1600/php-proxy/src/helpers.php in PHP-Proxy 5.1.0 uses weak cryptogr

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2018-19784 is a high-severity flaw (CVSS 7.5) affecting php-proxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The str_rot_pass function in vendor/atholn1600/php-proxy/src/helpers.php in PHP-Proxy 5.1.0 uses weak cryptography, which makes it easier for attackers to calculate the authorization data needed for local file inclusion.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-326
Published	2018-12-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: php-proxy

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

Am I affected?

Timeline

2018-12-01 00:29 UTCPublished CVE record published
2026-06-17 01:49 UTCUpdated Record last modified

php-proxy php-proxy DOWNGRADE

Affected: 5.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1.0

1. Check installed version

apt-cache policy php-proxy || rpm -q php-proxy || php-proxy --version

2. No fixed release: DOWNGRADE to a release before 5.1.0 (Debian / Ubuntu)

apt-cache madison php-proxy sudo apt install php-proxy=<VERSION_BEFORE_5.1.0> sudo apt-mark hold php-proxy

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

dnf --showduplicates list php-proxy sudo dnf downgrade php-proxy-<VERSION_BEFORE_5.1.0> sudo dnf versionlock add php-proxy

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-2018-19784?

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

Is CVE-2018-19784 being exploited?

CVE-2018-19784 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-2018-19784 affect?

CVE-2018-19784 affects php-proxy. Severity is high (CVSS 7.5). The str_rot_pass function in vendor/atholn1600/php-proxy/src/helpers.php in PHP-Proxy 5.1.0 uses weak cryptography, which makes it easier for attackers to calculate the authorization data needed for local file inclusion.

How urgent is CVE-2018-19784?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2018-19785 MEDIUM 6.1 UPGRADE PHP-Proxy through 5.1.0 has Cross-Site Scripting (XSS) via the URL field in index.php.
CVE-2018-19458 HIGH 7.5 DOWNGRADE In PHP Proxy 3.0.3, any user can read files from the server without authentication due to an index.php?q=file:

References

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