CVE-2021-30086: Cross Site Scripting (XSS) vulnerability exists in KindEditor (Chinese versions) 4.1.12, which can be exploite

Routine

MEDIUM 6.1DOWNGRADE

CVE-2021-30086 is a medium-severity flaw (CVSS 6.1) affecting kindeditor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability exists in KindEditor (Chinese versions) 4.1.12, which can be exploited by an attacker to obtain user cookie information.

Why this priority

No elevated risk signals yet

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	2021-09-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kindsoft

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

Am I affected?

Timeline

2021-09-28 19:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

kindsoft kindeditor DOWNGRADE

Affected: 4.1.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.12

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.1.12 (Debian / Ubuntu)

apt-cache madison kindeditor sudo apt install kindeditor=<VERSION_BEFORE_4.1.12> sudo apt-mark hold kindeditor

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

dnf --showduplicates list kindeditor sudo dnf downgrade kindeditor-<VERSION_BEFORE_4.1.12> sudo dnf versionlock add kindeditor

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-2021-30086?

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

Is CVE-2021-30086 being exploited?

CVE-2021-30086 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-2021-30086 affect?

CVE-2021-30086 affects kindeditor. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability exists in KindEditor (Chinese versions) 4.1.12, which can be exploited by an attacker to obtain user cookie information.

How urgent is CVE-2021-30086?

Priority 34/100. No elevated risk signals yet.

Related CVEs

CVE-2021-42228 HIGH 8.8 UPGRADE A Cross Site Request Forgery (CSRF) vulnerability exists in KindEditor 4.1.x, as demonstrated by examples/uplo
CVE-2021-42227 MEDIUM 6.1 UPGRADE Cross SIte Scripting (XSS) vulnerability exists in KindEditor 4.1.x via a Google search inurl:/examples/upload
CVE-2021-37267 MEDIUM 6.1 MITIGATE Cross Site Scripting (XSS) vulnerability exists in all versions of KindEditor, which can be exploited by an at
CVE-2020-28717 MEDIUM 6.1 DOWNGRADE Cross Site Scripting (XSS) vulnerability in content1 parameter in demo.jsp in kindsoft kindeditor version 4.1.
CVE-2019-7543 MEDIUM 6.1 DOWNGRADE In KindEditor 4.1.11, the php/demo.php content1 parameter has a reflected Cross-site Scripting (XSS) vulnerabi

References

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