CVE-2018-20463: An issue was discovered in the JSmol2WP plugin 1.07 for WordPress

Q: How do I fix CVE-2018-20463?

jsmol2wp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-20463 being exploited?

CVE-2018-20463 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-20463 affect?

CVE-2018-20463 affects jsmol2wp. Severity is high (CVSS 7.5). An issue was discovered in the JSmol2WP plugin 1.07 for WordPress. There is an arbitrary file read vulnerability via ../ directory traversal in query=php://filter/resource= in the jsmol.php query string. This can also be used for SSRF.

Q: How urgent is CVE-2018-20463?

Priority 60/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2018-20463 is a high-severity flaw (CVSS 7.5) affecting jsmol2wp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the JSmol2WP plugin 1.07 for WordPress. There is an arbitrary file read vulnerability via ../ directory traversal in query=php://filter/resource= in the jsmol.php query string. This can also be used for SSRF.

Why this priority

High severity
EPSS top 4%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	13.2% (top 4%)
CISA exploited list	No
Weakness	CWE-22
Published	2018-12-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jsmol2wp project

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

Am I affected?

Timeline

2018-12-25 21:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

jsmol2wp project jsmol2wp DOWNGRADE

Affected: 1.07

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.07

1. Check installed version

apt-cache policy jsmol2wp || rpm -q jsmol2wp || jsmol2wp --version

2. No fixed release: DOWNGRADE to a release before 1.07 (Debian / Ubuntu)

apt-cache madison jsmol2wp sudo apt install jsmol2wp=<VERSION_BEFORE_1.07> sudo apt-mark hold jsmol2wp

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

dnf --showduplicates list jsmol2wp sudo dnf downgrade jsmol2wp-<VERSION_BEFORE_1.07> sudo dnf versionlock add jsmol2wp

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: WordPress JSmol2WP <=1.07 - Local File Inclusion

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-2018-20463?

jsmol2wp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20463 being exploited?

CVE-2018-20463 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-2018-20463 affect?

CVE-2018-20463 affects jsmol2wp. Severity is high (CVSS 7.5). An issue was discovered in the JSmol2WP plugin 1.07 for WordPress. There is an arbitrary file read vulnerability via ../ directory traversal in query=php://filter/resource= in the jsmol.php query string. This can also be used for SSRF.

How urgent is CVE-2018-20463?

Priority 60/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities · PHP vulnerabilities

Related CVEs

CVE-2018-20462 MEDIUM 6.1 DOWNGRADE An issue was discovered in the JSmol2WP plugin 1.07 for WordPress

References

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