CVE-2017-20106: A vulnerability, which was classified as critical, has been found in Lithium Forum 2017 Q1

Routine

MEDIUM 5.3DOWNGRADE

CVE-2017-20106 is a medium-severity flaw (CVSS 5.3) affecting lithium forum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, has been found in Lithium Forum 2017 Q1. This issue affects some unknown processing of the component Compose Message Handler. The manipulation of the argument upload_url leads to server-side request forgery. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-918
Published	2022-06-28
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: khoros

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

Am I affected?

Timeline

2022-06-28 07:15 UTCPublished CVE record published
2026-06-17 01:15 UTCUpdated Record last modified

khoros lithium forum DOWNGRADE

Affected: 2017 q1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2017

1. Check installed version

apt-cache policy lithium-forum || rpm -q lithium-forum || lithium-forum --version

2. No fixed release: DOWNGRADE to a release before 2017 (Debian / Ubuntu)

apt-cache madison lithium-forum sudo apt install lithium-forum=<VERSION_BEFORE_2017> sudo apt-mark hold lithium-forum

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

dnf --showduplicates list lithium-forum sudo dnf downgrade lithium-forum-<VERSION_BEFORE_2017> sudo dnf versionlock add lithium-forum

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-2017-20106?

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

Is CVE-2017-20106 being exploited?

CVE-2017-20106 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-2017-20106 affect?

CVE-2017-20106 affects lithium forum. Severity is medium (CVSS 5.3). A vulnerability, which was classified as critical, has been found in Lithium Forum 2017 Q1. This issue affects some unknown processing of the component Compose Message Handler. The manipulation of the argument upload_url leads to server-sid

How urgent is CVE-2017-20106?

Priority 30/100. Public exploit reference

References

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