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NVD / CVE Program· CNA Acronis

CVE-2026-87886: Local privilege escalation due to insecure file permissions.

HighCVSS 7.8 · v3.0KEVWeaponized Fix available

Noroxi assessment

Priority: This week (action score 61/100)

  • CISA has confirmed exploitation in the wild (Sep 16, 2026). Remediation deadline for US federal agencies: Sep 19, 2026.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Acronis Acronis Backup extension for Plesk 1.8.11.638; Acronis Acronis Backup plugin for cPanel & WHM 1.9.3.1021; Acronis Acronis Backup plugin for DirectAdmin 1.2.3.238.

Don’t wait for the next maintenance window. Upgrade to Acronis Acronis Backup extension for Plesk 1.8.11.638; Acronis Acronis Backup plugin for cPanel & WHM 1.9.3.1021; Acronis Acronis Backup plugin for DirectAdmin 1.2.3.238 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

Published
Sep 17, 2026
Updated
Sep 18, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

61

This week

Don’t wait for the next maintenance window.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Acronis
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Sep 16, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Sep 19, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-87886

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
acronisacronis backup
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Acronis). Independent of NVD's CPE analysis and usually ahead of it.

  • Acronis Acronis Backup extension for Plesk

    • unspecified and later · before 1.8.11.638affected · semver

  • Acronis Acronis Backup plugin for cPanel & WHM

    • unspecified and later · before 1.9.3.1021affected · semver

  • Acronis Acronis Backup plugin for DirectAdmin

    • unspecified and later · before 1.2.3.238affected · semver
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • acronis acronis backupbefore 1.2.3
  • acronis acronis backupbefore 1.8.11
  • acronis acronis backupbefore 1.9.3
  • acronis acronis backup1.9.3

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Acronis Acronis Backup extension for Plesk1.8.11.638Vendor (CNA)
Acronis Acronis Backup plugin for cPanel & WHM1.9.3.1021Vendor (CNA)
Acronis Acronis Backup plugin for DirectAdmin1.2.3.238Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. CISA KEV-2 d
  2. Published
  3. TodayNov 14, 2026+57 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-276 · Incorrect Default Permissions

CVSS vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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