CVE-2018-20806: Phamm (aka PHP LDAP Virtual Hosting Manager) 0.6.8 allows XSS via the login page (the /public/main.php action

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MEDIUM 6.1DOWNGRADE

CVE-2018-20806 is a medium-severity flaw (CVSS 6.1) affecting phamm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Phamm (aka PHP LDAP Virtual Hosting Manager) 0.6.8 allows XSS via the login page (the /public/main.php action parameter).

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-03-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phamm

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

Am I affected?

Timeline

2019-03-17 23:32 UTCPublished CVE record published
2026-06-17 01:53 UTCUpdated Record last modified

phamm phamm DOWNGRADE

Affected: 0.6.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6.8 (Debian / Ubuntu)

apt-cache madison phamm sudo apt install phamm=<VERSION_BEFORE_0.6.8> sudo apt-mark hold phamm

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

dnf --showduplicates list phamm sudo dnf downgrade phamm-<VERSION_BEFORE_0.6.8> sudo dnf versionlock add phamm

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-2018-20806?

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

Is CVE-2018-20806 being exploited?

CVE-2018-20806 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-2018-20806 affect?

CVE-2018-20806 affects phamm. Severity is medium (CVSS 6.1). Phamm (aka PHP LDAP Virtual Hosting Manager) 0.6.8 allows XSS via the login page (the /public/main.php action parameter).

How urgent is CVE-2018-20806?

Priority 42/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2017-0378 MEDIUM 6.1 UPGRADE XSS exists in the login_form function in views/helpers.php in Phamm before 0.6.7, exploitable via the PATH_INF

References

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