# CVE-2026-87886: Acronis Backup Incorrect Default Permissions

> Local attackers can escalate privileges due to insecure file permissions in Acronis Backup plugins for cPanel, Plesk, and DirectAdmin.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 16 Sep 2026 (CISA KEV)
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-hrq3-qgq7-jm9x

## What is CVE-2026-87886?

CVE-2026-87886 is a high-severity vulnerability in Acronis Backup extension for Plesk, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2026-87886?

It affects 1 product.


Products: Acronis Acronis Backup.

## How do I fix CVE-2026-87886?

No fix has been published for CVE-2026-87886 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 19 Sep 2026.

## Is CVE-2026-87886 being exploited?

Yes. Attackers have exploited CVE-2026-87886 in the wild since at least 16 Sep 2026.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-87886 and fix it if it is affected.

What it is: CVE-2026-87886 is a high-severity vulnerability in Acronis Backup extension for Plesk, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-87886 in the wild since at least 16 Sep 2026.

Affected product: Acronis Backup extension for Plesk. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-87886/ (Markdown: https://insights.sbomify.com/CVE-2026-87886/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-87886
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-87886
- OSV: https://osv.dev/vulnerability/CVE-2026-87886

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-87886/
Summaries are generated and may contain mistakes; the official description above is the record.