CVE-2018-6464: Simditor v2.3.11 allows XSS via crafted use of svg/onload=alert in a TEXTAREA element, as demonstrated by Fire

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MEDIUM 6.1DOWNGRADE

CVE-2018-6464 is a medium-severity flaw (CVSS 6.1) affecting simditor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Simditor v2.3.11 allows XSS via crafted use of svg/onload=alert in a TEXTAREA element, as demonstrated by Firefox 54.0.1.

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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-01-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mycolorway

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

Am I affected?

Timeline

2018-01-31 18:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

mycolorway simditor DOWNGRADE

Affected: 2.3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.3.11 (Debian / Ubuntu)

apt-cache madison simditor sudo apt install simditor=<VERSION_BEFORE_2.3.11> sudo apt-mark hold simditor

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

dnf --showduplicates list simditor sudo dnf downgrade simditor-<VERSION_BEFORE_2.3.11> sudo dnf versionlock add simditor

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-2018-6464?

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

Is CVE-2018-6464 being exploited?

CVE-2018-6464 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-2018-6464 affect?

CVE-2018-6464 affects simditor. Severity is medium (CVSS 6.1). Simditor v2.3.11 allows XSS via crafted use of svg/onload=alert in a TEXTAREA element, as demonstrated by Firefox 54.0.1.

How urgent is CVE-2018-6464?

Priority 40/100. Public exploit reference

Software pages

Mozilla Firefox vulnerabilities

Related CVEs

CVE-2018-19048 MEDIUM 6.1 UPGRADE Simditor through 2.3.21 allows DOM XSS via an onload attribute within a malformed SVG element.

References

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