Medium severity · published Sep 12, 2026
CVE-2026-87797
Client Invoicing by Sprout Invoices < 20.8.16 - Subscriber+ Private Note Overwrite via si_edit_private_note
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
The Sprout Invoices WordPress plugin before 20.8.16 does not perform a capability or ownership check before allowing a private note to be overwritten through one of its AJAX actions, allowing any authenticated user such as a subscriber to overwrite private notes on records belonging to other users.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
Sprout Invoices ·
before 20.8.16 · source: vendor