CVE-2026-87886
Exploitation confirmed. First attested on 2026-09-15 by CISA-ADP, CISA KEV, GCVE · previdian.
- Published2026-09-17
- Fixed in1.9.3 · 1.8.11 · 1.2.3
- WeaknessCWE-276
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-11-03 15:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-87886?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-87886?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.9 | < 1.9.3 | 1.9.3 | NVD |
| 1.8 | < 1.8.11 | 1.8.11 | NVD |
| 1.2 | < 1.2.3 | 1.2.3 | NVD |
| 1.9 | = 1.9.3 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Products declared by the CNA3 products
As Acronis, the CNA that assigned this CVE, declared them in the CVE record; versions as written.
- Acronis Backup plugin for cPanel & WHMother versions: not affected
platforms: Linux
Affected- < 1.9.3.1021fixed in 1.9.3.1021semver
- Acronis Backup extension for Pleskother versions: not affected
platforms: Linux
Affected- < 1.8.11.638fixed in 1.8.11.638semver
- Acronis Backup plugin for DirectAdminother versions: not affected
platforms: Linux
Affected- < 1.2.3.238fixed in 1.2.3.238semver
Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-17
Fix
- Update Acronis acronis backup to 1.9.3 · 1.8.11 · 1.2.3
- CISA’s required action: 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.due 2026-09-19
Advisories and patches
- security-advisory.acronis.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
- Metasploit modules
- none listed Metasploit Framework
CISA Known Exploited Vulnerability
- Date Added
- 2026-09-16
- Patch Due Date
- 2026-09-19
- Ransomware Use
- Unknown
- Required Action
- 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.
Sources
- NVDCVE recordread 2026-10-23
- CISA KEVKEV entry2026-09-16
- ENISA EUVDexploitation2026-09-162026-09-16
- GCVEexploitation2026-09-15
- CISA-ADPSSVC decisionactive2026-09-18
- OpenCVESSVC decisionactive—
- CNACVSS 3.07.8known since 2026-10-23
- CNAweakness (CWE)CWE-276known since 2026-10-23
- FIRST EPSSEPSS score0.2 %2026-11-03
- GitHub Advisoriesadvisory—
Identifiers
- EUVD-2026-82595same flawENISA EUVD · LicenseRef-ENISA-legal-notice
- GHSA-hrq3-qgq7-jm9xsame flawGitHub Advisory Database · CC-BY-4.0
Technical details
- CVSS v3 Vector
- CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-09-17
- Last Modified
- 2026-09-18
- NVD status
- Analyzed
- GitHub Advisory
- GHSA-hrq3-qgq7-jm9x
Frequently asked questions
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.
Sources for this record
- CISA KEV · CC0-1.0 (cisagov/kev-data)
- CVE Program · CVE Program Terms of Use
- ENISA EU Vulnerability Database · ENISA legal notice §1.2 (reproduction authorised, provided the source is acknowledged)
- FIRST EPSS · EPSS terms of use (free use, attribution requested)
- GCVE · GCVE dump terms (preserve source attribution)
- GitHub Advisory Database · CC-BY-4.0 · GHSA-hrq3-qgq7-jm9x
- NVD · Public domain (17 U.S.C. § 105) for NVD-authored data; third-party content under its own terms
- OpenCVE · OpenCVE terms of service · terms restrict redistribution
- CISA Vulnrichment · CC0-1.0