CVE-2018-11091: An issue was discovered in MyBiz MyProcureNet 5.0.0

This month

CRITICAL 9.9DOWNGRADE

CVE-2018-11091 is a critical-severity flaw (CVSS 9.9) affecting myprocurenet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in MyBiz MyProcureNet 5.0.0. A malicious file can be uploaded to the webserver by an attacker. It is possible for an attacker to upload a script to issue operating system commands. This vulnerability occurs because an attacker is able to adjust the "HiddenFieldControlCustomWhiteListedExtensions" parameter and add arbitrary extensions to the whitelist during the upload. For instance, if the extension .asp is added to the "H

Why this priority

Critical severity

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

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.6% (top 10%)
CISA exploited list	No
Weakness	CWE-434
Published	2018-05-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mybiz

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

Am I affected?

Timeline

2018-05-14 23:29 UTCPublished CVE record published
2026-06-17 01:35 UTCUpdated Record last modified

mybiz myprocurenet DOWNGRADE

Affected: 5.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison myprocurenet sudo apt install myprocurenet=<VERSION_BEFORE_5.0.0> sudo apt-mark hold myprocurenet

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

dnf --showduplicates list myprocurenet sudo dnf downgrade myprocurenet-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add myprocurenet

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-2018-11091?

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

Is CVE-2018-11091 being exploited?

CVE-2018-11091 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-2018-11091 affect?

CVE-2018-11091 affects myprocurenet. Severity is critical (CVSS 9.9). An issue was discovered in MyBiz MyProcureNet 5.0.0. A malicious file can be uploaded to the webserver by an attacker. It is possible for an attacker to upload a script to issue operating system commands. This vulnerability occurs because a

How urgent is CVE-2018-11091?

Priority 57/100. Critical severity

Related CVEs

CVE-2018-11090 MEDIUM 6.1 DOWNGRADE An XSS issue was discovered in MyBiz MyProcureNet 5.0.0

References

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