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TI-2026-81800 Aliases CVE-2026-87099GHSA-m2j6-gmm3-8683

Cross-site scripting in Acronis Cyber Protect 17

Priority LOW 27CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
High
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Acronis Cyber Protect 17 on Linux and Windows is affected before build 42587. Improper input validation leads to cross-site scripting (CWE-79). Exploitation requires high privileges and user interaction, and a successful attack could affect confidentiality and integrity of the affected data.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

Cross-site scripting (XSS) vulnerability due to improper input validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00242 15th percentileScored 2026-11-08
Fix Fixed Acronis Cyber Protect 17 (Acronis): 42587

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AcronisAcronis Cyber Protect 17before 4258742587Patch availableCNA
  • Acronis Cyber Protect 17 VendorAcronis Affected before 42587 Fixed in 42587 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:acronis:cyber_protect:*:*:*:*:*:*:*:*——Acronis
  • cpe:2.3:a:acronis:cyber_protect:*:*:*:*:*:*:*:* Versions — — ·Acronis

Remediation

Update Acronis Cyber Protect 17 to build 42587 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA Acronis Cyber Protect 17 (Acronis) Fixed in 42587

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Acronis Cyber Protect 17 42587

    11 records Highest priority Priority LOW 11 LOW

    Other records, highest priority first

    • TI-2026-81804 Token validation flaw in Acronis Cyber Protect 17 exposes dataPriority LOW 34
    • TI-2026-81803 Acronis Cyber Protect 17 token validation disclosure and manipulationPriority LOW 34
    • TI-2025-43981 Local privilege escalation in Acronis Cyber Protect productsPriority LOW 33
    Show all 11 records →

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-87099
  2. 2026-10-28 Alias added: GHSA-m2j6-gmm3-8683
  3. 2026-10-30 Priority changed: MEDIUM → LOW
  4. 2026-11-06 CISA SSVC decision points changed

References

Advisory 1

  • TI-2023-24253 Remote command execution due to use of default passwords. KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-59964 Incorrect default permissions in Acronis Backup plugin for cPanel & WHM KEVCVSS 3.0HIGH 7.8
  • TI-2022-03146 Improper privilege management in Acronis Cyber Protect 15 CVSS 3.1HIGH 8.8
  • TI-2025-21714 Weak authentication in Acronis Cyber Protect 16 CVSS 3.0CRITICAL 10.0
  • TI-2025-21713 Weak authentication in Acronis Cyber Protect 16 CVSS 3.0CRITICAL 10.0
  • TI-2025-21712 Missing authentication in Acronis Cyber Protect Cloud Agent CVSS 3.0CRITICAL 9.8
See all 231 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences