CVE-2021-24787: The Client Invoicing by Sprout Invoices WordPress plugin before 19.9.7 does not sanitise and escape some of it

Q: How do I fix CVE-2021-24787?

client invoicing by sprout invoices: upgrade to 19.9.7. Exact commands for each OS are on this page.

Q: Is CVE-2021-24787 being exploited?

CVE-2021-24787 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-2021-24787 affect?

CVE-2021-24787 affects client invoicing by sprout invoices. Severity is medium (CVSS 4.8). The Client Invoicing by Sprout Invoices WordPress plugin before 19.9.7 does not sanitise and escape some of its settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capabilit

Q: How urgent is CVE-2021-24787?

Priority 34/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2021-24787 is a medium-severity flaw (CVSS 4.8) affecting client invoicing by sprout invoices. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Client Invoicing by Sprout Invoices WordPress plugin before 19.9.7 does not sanitise and escape some of its settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-17
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: webventures

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

Am I affected?

Timeline

2021-11-17 11:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

webventures client invoicing by sprout invoices UPGRADE

Affected: < 19.9.7

Fixed in: 19.9.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy client-invoicing-by-sprout-invoices || rpm -q client-invoicing-by-sprout-invoices || client-invoicing-by-sprout-invoices --version

2. UPGRADE to 19.9.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade client-invoicing-by-sprout-invoices

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade client-invoicing-by-sprout-invoices

Note

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

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-2021-24787?

client invoicing by sprout invoices: upgrade to 19.9.7. Exact commands for each OS are on this page.

Is CVE-2021-24787 being exploited?

CVE-2021-24787 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-2021-24787 affect?

CVE-2021-24787 affects client invoicing by sprout invoices. Severity is medium (CVSS 4.8). The Client Invoicing by Sprout Invoices WordPress plugin before 19.9.7 does not sanitise and escape some of its settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capabilit

How urgent is CVE-2021-24787?

Priority 34/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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