ZeusQA
Start free

Known exploited vulnerability

CVE-2026-87886

highCVSS 3.0 7.8In CISA KEVEPSS 0.23%Published · Acronis

The short answer

CVE-2026-87886 affects Acronis Acronis Backup plugin for cPanel & WHM and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-09-16: attackers are using it, so patch it first.

What it is

Local privilege escalation due to insecure file permissions. The following products are affected: Acronis Backup plugin for cPanel & WHM (Linux) before build 1.9.3.1021, Acronis Backup extension for Plesk (Linux) before build 1.8.11.638, Acronis Backup plugin for DirectAdmin (Linux) before build 1.2.3.238.

Weakness: CWE-276.

Severity

7.8 high

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Sep 16, 2026

Federal due date Sep 19, 2026

EPSS, next 30 days

0.23%

Higher than 14% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

Affected products

Acronis Backup plugin for cPanel & WHM, Acronis Backup extension for Plesk, Acronis Backup plugin for DirectAdmin. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-87886 being exploited?

Yes. CISA added CVE-2026-87886 to its Known Exploited Vulnerabilities catalog on 2026-09-16, with a federal remediation due date of 2026-09-19.

How do I fix CVE-2026-87886?

CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

Related

Know the day a CVE lands in your code

Connect a GitHub repository and ZeusQA checks its dependencies daily, briefs each advisory and opens the fix. Three test runs free, no card.

Start freeSee how a run works