CVE-2026-87886
HIGHCISA KEVDescription
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 to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
EPSS data unavailable for this CVE.
Acronis Backup Incorrect Default Permissions Vulnerability
Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.
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.
Remediation due: 2026-09-19
References
Related Vulnerabilities
Other CWE-276 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2013-0632 | Critical | 9.8 | 94% | KEV | - |
| CVE-2017-11610 | High | 8.8 | 87% | - | Fix |
| CVE-2023-29919 | Critical | 9.1 | 60% | - | - |
| CVE-2019-17124 | Critical | 9.8 | 23% | - | - |
| CVE-2020-12608 | High | 7.8 | 22% | - | Fix |
| CVE-2021-3437 | Critical | 9.8 | 16% | - | Fix |
Common questions
How do I fix CVE-2026-87886?
Upgrade acronis backup to 1.2.3 or later.
Is CVE-2026-87886 being actively exploited?
Yes. CVE-2026-87886 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-09-19. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2026-87886?
CVE-2026-87886 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-87886 affect?
Published advisories record a fix for acronis backup (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-87886
Markdown
[](https://tridentstack.com/cve/CVE-2026-87886)HTML
<a href="https://tridentstack.com/cve/CVE-2026-87886"><img src="https://tridentstack.com/cve/badge/CVE-2026-87886.svg" alt="CVE-2026-87886"></a>This vulnerability is actively exploited in the wild
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-18.