CVE-2026-87886

HIGH CISA KEV
Published Sep 17, 2026 Modified Sep 18, 2026 CWE-276

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.

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CVSS v3.1 Score

7.8
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0023
Probability of exploitation
0.13%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Sep 16, 2026 Remediation due: Sep 19, 2026

Weakness Type (CWE)

CWE-276 Incorrect Default Permissions

Affected Products

Vendor Product
acronis acronis_backup
acronis acronis_backup
acronis acronis_backup
acronis acronis_backup
acronis acronis_backup
acronis acronis_backup
linux linux_kernel

References

Frequently Asked Questions

What is CVE-2026-87886? +
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. It has a CVSS v3.1 base score of 7.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2026-87886? +
CVE-2026-87886 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0023, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-87886? +
CVE-2026-87886 affects products from acronis, linux, specifically: acronis_backup, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-87886? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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