How severe is CVE-2026-87886?

CVE-2026-87886 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-87886 being actively exploited?

Yes. CVE-2026-87886 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-16, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-87886?

CVE-2026-87886 primarily affects Acronis Acronis Backup. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-87886?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-87886 published?

CVE-2026-87886 was published on 2026-09-17 and last updated on 2026-09-18.

CVE-2026-87886

CVE-2026-87886 is a high-severity vulnerability in Acronis Acronis Backup with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-09-16). The underlying weakness is classified as CWE-276.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-09-16)
Weakness: CWE-276
Affected product: Acronis Acronis Backup
Published: 2026-09-17
Last modified: 2026-09-18

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.

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.
How severe is CVE-2026-87886?: CVE-2026-87886 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-87886 being actively exploited?: Yes. CVE-2026-87886 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-16, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-87886?: CVE-2026-87886 primarily affects Acronis Acronis Backup. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-87886?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-87886 published?: CVE-2026-87886 was published on 2026-09-17 and last updated on 2026-09-18.

References

Affected products (6)

cpe:2.3:a:acronis:acronis_backup:*:*:*:*:*:directadmin:*:*
cpe:2.3:a:acronis:acronis_backup:*:*:*:*:*:plesk:*:*
cpe:2.3:a:acronis:acronis_backup:*:*:*:*:*:cpanel:*:*
cpe:2.3:a:acronis:acronis_backup:1.9.3:-:*:*:*:cpanel:*:*
cpe:2.3:a:acronis:acronis_backup:1.9.3:hotfix1:*:*:*:cpanel:*:*
cpe:2.3:a:acronis:acronis_backup:1.9.3:hotfix2:*:*:*:cpanel:*:*

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