CVE-2026-87886
HighExploitedPublic exploitLocal privilege escalation due to insecure file permissions.
Published Sep 17, 2026 · Updated Sep 18, 2026 · Also known as EUVD-2026-82595, GHSA-hrq3-qgq7-jm9x
Key Facts
Patch immediately- CVE-2026-87886 is a high-severity vulnerability (CVSS 7.8 v3) affecting Acronis Backup, Acronis Backup extension for Plesk, Acronis Backup plugin for cPanel & WHM and 1 more product.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 15, 2026. Public exploit code is available.
- EPSS estimates a 0.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including Acronis Backup 1.2.3, Acronis Backup 1.8.11, Acronis Backup 1.9.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3
7.8
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
0.2%
Higher than 13.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-87886 brief as a PDF
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 16, 2026 | Sep 19, 2026 | Not reported |
| Industry KEV feed | Sep 15, 2026 | Sep 19, 2026 | Not reported |
| CIRCL KEV | Sep 15, 2026 | Sep 19, 2026 | Not reported |
| ENISA EUVD | Sep 16, 2026 | n/a | Not reported |
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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected Products
12 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Acronis BackupAcronis | 1.9.3, 1.9.3-hotfix1, 1.9.3-hotfix2 | 1.9.3 |
| Acronis Backup extension for Plesk | >= unspecified | 1.8.11.638 |
| Acronis Backup plugin for cPanel & WHM | >= unspecified | 1.9.3.1021 |
| Acronis Backup plugin for DirectAdmin | >= unspecified | 1.2.3.238 |
Patched Releases
Acronis Backup
1.2.3, 1.8.11, 1.9.3
Acronis Backup extension for Plesk
1.8.11.638
Acronis Backup plugin for cPanel & WHM
1.9.3.1021
Acronis Backup plugin for DirectAdmin
1.2.3.238
Timeline
Added to Industry KEV feed
Sep 15, 2026
Added to CIRCL KEV
Sep 15, 2026
Added to CISA KEV
Sep 16, 2026
Added to ENISA EUVD
Sep 16, 2026
Publicly disclosed
Sep 17, 2026
Last updated
Sep 18, 2026
Weakness Type
- CWE-276 Incorrect Default Permissions
References
FAQ
Common Questions.
Local privilege escalation due to insecure file permissions.
Affected: Acronis Backup versions 1.9.3, 1.9.3-hotfix1, 1.9.3-hotfix2; Acronis Backup extension for Plesk versions >= unspecified; Acronis Backup plugin for cPanel & WHM versions >= unspecified, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 15, 2026.
Yes. It was added on Sep 16, 2026 with a federal remediation due date of Sep 19, 2026.
Public exploit code is available.
Fixed versions are available, including Acronis Backup 1.2.3, Acronis Backup 1.8.11, Acronis Backup 1.9.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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