CVE-2018-7316: Arbitrary File Upload exists in the Proclaim 9.1.1 component for Joomla! via a mediafileform action.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-7316 is a critical-severity flaw (CVSS 9.8) affecting proclaim. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Arbitrary File Upload exists in the Proclaim 9.1.1 component for Joomla! via a mediafileform action.

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited
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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	8.1% (top 5%)
CISA exploited list	No
Weakness	CWE-434
Published	2018-02-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: christianwebministries

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

Am I affected?

Timeline

2018-02-22 19:29 UTCPublished CVE record published
2026-06-17 02:03 UTCUpdated Record last modified

christianwebministries proclaim DOWNGRADE

Affected: 9.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.1.1 (Debian / Ubuntu)

apt-cache madison proclaim sudo apt install proclaim=<VERSION_BEFORE_9.1.1> sudo apt-mark hold proclaim

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

dnf --showduplicates list proclaim sudo dnf downgrade proclaim-<VERSION_BEFORE_9.1.1> sudo dnf versionlock add proclaim

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Joomla! Component Proclaim 9.1.1 - Arbitrary File Upload

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-2018-7316?

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

Is CVE-2018-7316 being exploited?

CVE-2018-7316 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-2018-7316 affect?

CVE-2018-7316 affects proclaim. Severity is critical (CVSS 9.8). Arbitrary File Upload exists in the Proclaim 9.1.1 component for Joomla! via a mediafileform action.

How urgent is CVE-2018-7316?

Priority 68/100. Critical severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Joomla vulnerabilities

Related CVEs

CVE-2018-7317 HIGH 7.5 DOWNGRADE Backup Download exists in the Proclaim 9.1.1 component for Joomla! via a direct request for a .sql file under

References

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