Local privilege escalation due to insecure file permissions.
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% · 13th percentile
- CWE
- CWE-276
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Report tools
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 government agencies: Sep 19, 2026.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| acronis | acronis backup | cpe:2.3:a:acronis:acronis_backup |
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
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
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
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Acronis Acronis Backup extension for Plesk | 1.8.11.638 | Vendor (CNA) |
| Acronis Acronis Backup plugin for cPanel & WHM | 1.9.3.1021 | Vendor (CNA) |
| Acronis Acronis Backup plugin for DirectAdmin | 1.2.3.238 | Vendor (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.
- CISA KEV-2 d
- Published
- TodaySep 29, 2026+12 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
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 PermissionsCVSS 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.
Attack patterns (CAPEC)
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- security-advisory.acronis.com/advisories/SEC-10986
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886
Vendor advisories and official records. Exploit/PoC links are deliberately left out.