CVE-2026-87886 Acronis Backup: software flaw
In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.
Confirmed exploited by CISA on · US federal patch deadline Sep 19, 2026
What to do
- Install Acronis's security update for Backup. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Acronis Backup Incorrect Default Permissions Vulnerability
- Product
- Acronis Backup
- CISA description
- Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.
- Type of flaw
- Software flaw (CWE-276)
- Confirmed exploited
- Sep 16, 2026
- US federal patch deadline
- Sep 19, 2026
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Answering about CVE-2026-87886 ·
Questions about CVE-2026-87886
Is CVE-2026-87886 being exploited?
Yes. CISA added CVE-2026-87886 to its Known Exploited Vulnerabilities catalog on Sep 16, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-87886?
Install Acronis's security update for Backup. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2026-87886?
Only if you use Acronis Backup. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.