Threat Intelligence / CVE / CVE-2026-87886

CVE-2026-87886 — Acronis Backup plugin for cPanel & WHM

CISA KEV

CVSS v3.1 7.8 (HIGH) · Priority 9/10 · Published 2026-09-17

As of 2026-09-17, CVE-2026-87886 is a HIGH-severity vulnerability in Acronis Backup plugin for cPanel & WHM, CVSS v3.1 7.8. It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-09-16), with a US federal remediation deadline of 2026-09-19. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-87886, most recently “CISA KEV Catalog Addition: Active Exploitation of Cisco ISE Authentication Bypass (CVE-2026-76460) and Acronis Backup Privilege Escalation (CVE-2026-87886)”.

Last updated: 2026-09-17

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.

The record classifies CVE-2026-87886 under weakness class CWE-276. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1 day ago.

Severity and exploitation probability

CVSS v3.1 base score: 7.8 — HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA KEV: Listed since 2026-09-16, federal remediation deadline 2026-09-19
Threadlinqs priority: 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published: 2026-09-17

Is CVE-2026-87886 being exploited?

CISA added CVE-2026-87886 to the Known Exploited Vulnerabilities catalog on 2026-09-16, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-09-19 under BOD 22-01. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

Affected products and versions

Acronis: Backup plugin for cPanel & WHM, Backup extension for Plesk, Backup plugin for DirectAdmin

How to fix CVE-2026-87886

Because CVE-2026-87886 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-09-19. No vendor patch reference has been recorded for CVE-2026-87886 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-87886

2 tracked threats in the Threadlinqs corpus reference CVE-2026-87886, either in the campaign’s CVE list or as an indicator on the campaign record.

CISA KEV Catalog Addition: Active Exploitation of Cisco ISE Authentication Bypass (CVE-2026-76460) and Acronis Backup Privilege Escalation (CVE-2026-87886) — CRITICAL · 2026-09-16
CVE-2026-87886: Actively Exploited Privilege Escalation Flaw in Acronis cPanel Backup Plugin — HIGH · 2026-09-15

Sources

Enriched from CVE.org, NVD, CISA KEV. Last verified by Threadlinqs on 2026-09-18. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

security-advisory.acronis.com — vendor advisory

Full detection coverage & IOCs for threats exploiting CVE-2026-87886 are available via the Threadlinqs MCP server (Purple tier). View plans →

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