CVE-2018-9126: The DNNArticle module 11 for DNN (formerly DotNetNuke) allows remote attackers to read the web.config file, an

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-9126 is a critical-severity flaw (CVSS 9.8) affecting dnnarticle. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The DNNArticle module 11 for DNN (formerly DotNetNuke) allows remote attackers to read the web.config file, and consequently discover database credentials, via the /GetCSS.ashx/?CP=%2fweb.config URI.

Why this priority

Critical severity
EPSS top 1%: 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	48.9% (top 1%)
CISA exploited list	No
Weakness	CWE-200
Published	2018-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zldnn

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

Am I affected?

Timeline

2018-04-04 19:29 UTCPublished CVE record published
2026-06-17 02:06 UTCUpdated Record last modified

zldnn dnnarticle DOWNGRADE

Affected: 11

Fixed in: no fixed release known

Safe to downgrade to: a release before 11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 11 (Debian / Ubuntu)

apt-cache madison dnnarticle sudo apt install dnnarticle=<VERSION_BEFORE_11> sudo apt-mark hold dnnarticle

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

dnf --showduplicates list dnnarticle sudo dnf downgrade dnnarticle-<VERSION_BEFORE_11> sudo dnf versionlock add dnnarticle

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: DotNetNuke DNNarticle Module 11 - Directory Traversal

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-2018-9126?

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

Is CVE-2018-9126 being exploited?

CVE-2018-9126 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-2018-9126 affect?

CVE-2018-9126 affects dnnarticle. Severity is critical (CVSS 9.8). The DNNArticle module 11 for DNN (formerly DotNetNuke) allows remote attackers to read the web.config file, and consequently discover database credentials, via the /GetCSS.ashx/?CP=%2fweb.config URI.

How urgent is CVE-2018-9126?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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