What is CVE-2023-28731?

CVE-2023-28731 is a critical-severity vulnerability in Acymailing, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2023-03-30.

How severe is CVE-2023-28731?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-28731 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Acymailing

CVE-2023-28731

AnyMailing Joomla Plugin is vulnerable to unauthenticated remote code execution, when being granted access to the campaign's creation on front-office due to unrestricted file upload allowing PHP code to be injected. This issue affects AnyMailing Joomla Plugin Enterprise in versions below 8.3.0.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2023-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Acymailing
Acymailing Newsletter Plugin For Joomla In The Enterprise Version — versions 0

Weakness classification (CWE)

Public proof-of-concept exploits

References

www.acymailing.com/change-log/ (Release Notes)
www.bugbounty.ch/advisories/CVE-2023-28731 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-28731?: CVE-2023-28731 is a critical-severity vulnerability in Acymailing, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2023-03-30.
How severe is CVE-2023-28731?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-28731 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.