CVE-2020-18766: A cross-site scripting (XSS) vulnerability AntSword v2.0.7 can remotely execute system commands.

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CRITICAL 9.6DOWNGRADE

CVE-2020-18766 is a critical-severity flaw (CVSS 9.6) affecting antsword. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (XSS) vulnerability AntSword v2.0.7 can remotely execute system commands.

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-10-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: antsword project

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

Am I affected?

Timeline

2020-10-26 16:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

antsword project antsword DOWNGRADE

Affected: 2.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.7 (Debian / Ubuntu)

apt-cache madison antsword sudo apt install antsword=<VERSION_BEFORE_2.0.7> sudo apt-mark hold antsword

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

dnf --showduplicates list antsword sudo dnf downgrade antsword-<VERSION_BEFORE_2.0.7> sudo dnf versionlock add antsword

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-2020-18766?

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

Is CVE-2020-18766 being exploited?

CVE-2020-18766 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-2020-18766 affect?

CVE-2020-18766 affects antsword. Severity is critical (CVSS 9.6). A cross-site scripting (XSS) vulnerability AntSword v2.0.7 can remotely execute system commands.

How urgent is CVE-2020-18766?

Priority 55/100. Critical severity; Public exploit reference

Related CVEs

CVE-2020-25470 MEDIUM 6.1 DOWNGRADE AntSword 2.1.8.1 contains a cross-site scripting (XSS) vulnerability in the View Site funtion
CVE-2019-13970 MEDIUM 6.1 UPGRADE In antSword before 2.1.0, self-XSS in the database configuration leads to code execution via modules/database/

References

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