CVE-2020-23849: Stored XSS was discovered in the tree mode of jsoneditor before 9.0.2 through injecting and executing JavaScri

This month

MEDIUM 6.1UPGRADE

CVE-2020-23849 is a medium-severity flaw (CVSS 6.1) affecting jsoneditor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stored XSS was discovered in the tree mode of jsoneditor before 9.0.2 through injecting and executing JavaScript.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

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	2021-01-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jsoneditoronline

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

Am I affected?

Timeline

2021-01-11 14:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

jsoneditoronline jsoneditor UPGRADE

Affected: >= 8.6.6 and < 9.0.2

Fixed in: 9.0.2

Safe to downgrade to: a release before 8.6.6

1. Check installed version

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

2. UPGRADE to 9.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jsoneditor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jsoneditor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.6.6 (Debian / Ubuntu)

apt-cache madison jsoneditor sudo apt install jsoneditor=<VERSION_BEFORE_8.6.6> sudo apt-mark hold jsoneditor

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jsoneditor sudo dnf downgrade jsoneditor-<VERSION_BEFORE_8.6.6> sudo dnf versionlock add jsoneditor

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-2020-23849?

jsoneditor: upgrade to 9.0.2. Exact commands for each OS are on this page.

Is CVE-2020-23849 being exploited?

CVE-2020-23849 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-2020-23849 affect?

CVE-2020-23849 affects jsoneditor. Severity is medium (CVSS 6.1). Stored XSS was discovered in the tree mode of jsoneditor before 9.0.2 through injecting and executing JavaScript.

How urgent is CVE-2020-23849?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2021-3822 HIGH 7.5 UPGRADE jsoneditor is vulnerable to Inefficient Regular Expression Complexity

References

← Back to latest CVEs