CVE-2020-23647: Cross Site Scripting (XSS) vulnerability in BoxBilling 4.19, 4.19.1, 4.20, and 4.21 allows remote attackers to

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-23647 is a medium-severity flaw (CVSS 6.1) affecting boxbilling. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in BoxBilling 4.19, 4.19.1, 4.20, and 4.21 allows remote attackers to run arbitrary code via the message field on the submit new ticket form.

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	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-04-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: boxbilling

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

Am I affected?

Timeline

2023-04-28 20:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

boxbilling boxbilling DOWNGRADE

Affected: 4.19 · 4.19.1 · 4.20 · 4.21

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.19

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.19 (Debian / Ubuntu)

apt-cache madison boxbilling sudo apt install boxbilling=<VERSION_BEFORE_4.19> sudo apt-mark hold boxbilling

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

dnf --showduplicates list boxbilling sudo dnf downgrade boxbilling-<VERSION_BEFORE_4.19> sudo dnf versionlock add boxbilling

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-2020-23647?

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

Is CVE-2020-23647 being exploited?

CVE-2020-23647 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-2020-23647 affect?

CVE-2020-23647 affects boxbilling. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability in BoxBilling 4.19, 4.19.1, 4.20, and 4.21 allows remote attackers to run arbitrary code via the message field on the submit new ticket form.

How urgent is CVE-2020-23647?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2022-3552 HIGH 7.2 UPGRADE Unrestricted Upload of File with Dangerous Type in GitHub repository boxbilling/boxbilling prior to 0.0.1.

References

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