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 25 days 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 - EPSS (FIRST)
- 0.2% probability of exploitation in the next 30 days, higher than 17.3% of all scored CVEs
- 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, last modified 2026-09-18
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 44 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
Vendor advisory: https://security-advisory.acronis.com/advisories/SEC-10986. 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. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
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.
Sources
Enriched from CVE.org, NVD, CISA KEV, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.