CVE-2020-18259: ED01-CMS v1.0 was discovered to contain a reflective cross-site scripting (XSS) vulnerability in the component

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-18259 is a medium-severity flaw (CVSS 6.1) affecting ed01-cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ED01-CMS v1.0 was discovered to contain a reflective cross-site scripting (XSS) vulnerability in the component sposts.php. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload inserted into the Post title or Post content fields.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ed01-cms project

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

Am I affected?

Timeline

2021-11-03 18:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

ed01-cms project ed01-cms DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy ed01-cms || rpm -q ed01-cms || ed01-cms --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison ed01-cms sudo apt install ed01-cms=<VERSION_BEFORE_1.0> sudo apt-mark hold ed01-cms

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

dnf --showduplicates list ed01-cms sudo dnf downgrade ed01-cms-<VERSION_BEFORE_1.0> sudo dnf versionlock add ed01-cms

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-2020-18259?

ed01-cms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-18259 being exploited?

CVE-2020-18259 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-2020-18259 affect?

CVE-2020-18259 affects ed01-cms. Severity is medium (CVSS 6.1). ED01-CMS v1.0 was discovered to contain a reflective cross-site scripting (XSS) vulnerability in the component sposts.php. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload inserted into the

How urgent is CVE-2020-18259?

Priority 39/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2020-18262 CRITICAL 9.8 DOWNGRADE ED01-CMS v1.0 was discovered to contain a SQL injection in the component cposts.php via the cid parameter.
CVE-2020-18261 CRITICAL 9.8 DOWNGRADE An arbitrary file upload vulnerability in the image upload function of ED01-CMS v1.0 allows attackers to execu

References

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