CVE-2020-18166: Unrestricted File Upload in LAOBANCMS v2.0 allows remote attackers to upload arbitrary files by attaching a fi

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-18166 is a critical-severity flaw (CVSS 9.8) affecting laobancms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted File Upload in LAOBANCMS v2.0 allows remote attackers to upload arbitrary files by attaching a file with a ".jpg.php" extension to the component "admin/wenjian.php?wj=../templets/pc".

Why this priority

Critical severity
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	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-05-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: laobancms

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

Am I affected?

Timeline

2021-05-14 14:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

laobancms laobancms DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison laobancms sudo apt install laobancms=<VERSION_BEFORE_2.0> sudo apt-mark hold laobancms

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

dnf --showduplicates list laobancms sudo dnf downgrade laobancms-<VERSION_BEFORE_2.0> sudo dnf versionlock add laobancms

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-2020-18166?

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

Is CVE-2020-18166 being exploited?

CVE-2020-18166 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-2020-18166 affect?

CVE-2020-18166 affects laobancms. Severity is critical (CVSS 9.8). Unrestricted File Upload in LAOBANCMS v2.0 allows remote attackers to upload arbitrary files by attaching a file with a ".jpg.php" extension to the component "admin/wenjian.php?wj=../templets/pc".

How urgent is CVE-2020-18166?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-18167 MEDIUM 4.8 DOWNGRADE Cross Site Scripting (XSS) in LAOBANCMS v2.0 allows remote attackers to execute arbitrary code by injecting co
CVE-2020-18165 MEDIUM 4.8 DOWNGRADE Cross Site Scripting (XSS) in LAOBANCMS v2.0 allows remote attackers to execute arbitrary code by injecting co
CVE-2018-19328 CRITICAL 9.8 DOWNGRADE LAOBANCMS 2.0 allows install/mysql_hy.php?riqi=../ Directory Traversal.
CVE-2018-19229 MEDIUM 5.4 DOWNGRADE An issue was discovered in LAOBANCMS 2.0
CVE-2018-19228 HIGH 7.5 DOWNGRADE An issue was discovered in LAOBANCMS 2.0

References

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