CVE-2020-35346: CXUUCMS V3 3.1 is affected by a reflected XSS vulnerability that allows remote attackers to inject arbitrary w

Routine

MEDIUM 4.8DOWNGRADE

CVE-2020-35346 is a medium-severity flaw (CVSS 4.8) affecting cxuucms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CXUUCMS V3 3.1 is affected by a reflected XSS vulnerability that allows remote attackers to inject arbitrary web script or HTML via the imgurl parameter of admin.php?c=content&a=add.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-12-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cxuu

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

Am I affected?

Timeline

2020-12-26 04:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

cxuu cxuucms DOWNGRADE

Affected: 3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1 (Debian / Ubuntu)

apt-cache madison cxuucms sudo apt install cxuucms=<VERSION_BEFORE_3.1> sudo apt-mark hold cxuucms

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

dnf --showduplicates list cxuucms sudo dnf downgrade cxuucms-<VERSION_BEFORE_3.1> sudo dnf versionlock add cxuucms

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-2020-35346?

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

Is CVE-2020-35346 being exploited?

CVE-2020-35346 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-2020-35346 affect?

CVE-2020-35346 affects cxuucms. Severity is medium (CVSS 4.8). CXUUCMS V3 3.1 is affected by a reflected XSS vulnerability that allows remote attackers to inject arbitrary web script or HTML via the imgurl parameter of admin.php?c=content&a=add.

How urgent is CVE-2020-35346?

Priority 35/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-42970 MEDIUM 6.1 DOWNGRADE Cross Site Scripting (XSS) vulnerability exists in cxuucms v3 via the imgurl of /feedback/post/ content parame
CVE-2021-3264 HIGH 7.2 DOWNGRADE SQL Injection vulnerability in cxuucms 3.1 ivia the pid parameter in public/admin.php.
CVE-2021-39599 MEDIUM 6.1 DOWNGRADE Multiple Cross Site Scripting (XSS) vulnerabilities exists in CXUUCMS 3.1 in the search and c parameters in (1
CVE-2020-35347 MEDIUM 6.5 DOWNGRADE CXUUCMS V3 3.1 has a CSRF vulnerability that can add an administrator account via admin.php?c=adminuser&a=add.
CVE-2020-29250 MEDIUM 6.1 DOWNGRADE CXUUCMS V3 allows XSS via the first and third input fields to /public/admin.php.

References

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