CVE-2018-9920: Server side request forgery exists in the runtime application in K2 smartforms 4.6.11 via a modified hostname

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MEDIUM 6.5REMOTEDOWNGRADE

CVE-2018-9920 is a medium-severity flaw (CVSS 6.5) affecting smartforms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Server side request forgery exists in the runtime application in K2 smartforms 4.6.11 via a modified hostname in an https://*/Identity/STS/Forms/Scripts URL.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-918
Published	2018-05-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: k2

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

Am I affected?

Timeline

2018-05-24 13:29 UTCPublished CVE record published
2026-06-17 02:07 UTCUpdated Record last modified

k2 smartforms DOWNGRADE

Affected: 4.6.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.6.11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.6.11 (Debian / Ubuntu)

apt-cache madison smartforms sudo apt install smartforms=<VERSION_BEFORE_4.6.11> sudo apt-mark hold smartforms

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

dnf --showduplicates list smartforms sudo dnf downgrade smartforms-<VERSION_BEFORE_4.6.11> sudo dnf versionlock add smartforms

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-2018-9920?

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

Is CVE-2018-9920 being exploited?

CVE-2018-9920 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-2018-9920 affect?

CVE-2018-9920 affects smartforms. Severity is medium (CVSS 6.5). Server side request forgery exists in the runtime application in K2 smartforms 4.6.11 via a modified hostname in an https://*/Identity/STS/Forms/Scripts URL.

How urgent is CVE-2018-9920?

Priority 42/100. Remotely exploitable, no login, no user action

References

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