Acronis Cyber Protect 17: Logging of Excessive Data
CVE-2026-28718 is a high-severity logging of excessive data vulnerability in Acronis Cyber Protect 17 from Acronis, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 41186 as the first without the flaw, so updating Acronis Cyber Protect 17 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.39% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Acronis Cyber Protect 17 to 41186 or a later version.
- Update Cyber Protect to 17.0.41186 or a later version.
- Read the advisory on security-advisory.acronis.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Acronis | Acronis Cyber Protect 17 | before 41186 | 41186 |
| Acronis | Cyber Protect | before 17.0.41186 | 17.0.41186 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.0 | 5.3 | Medium | CNA (acronis.com) |
Official description
Denial of service due to insufficient input validation in authentication logging. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 41186.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Logging of Excessive Data
The product logs too much information, making log files hard to process and possibly hindering recovery efforts or forensic analysis after an attack.
How developers prevent this class of flaw
- Suppress large numbers of duplicate log messages and replace them with periodic summaries. For example, syslog may include an entry that states last message repeated X times when recording repeated events.
- Support a maximum size for the log file that can be controlled by the administrator. If the maximum size is reached, the admin should be notified. Also, consider reducing functionality of the product. This may result in a denial-of-service to legitimate product users, but it will prevent the product from adversely impacting the entire system.
- Adjust configurations appropriately when the product is transitioned from a debug state to production.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Acronis Cyber Protect 17
- 7.4 High severity
- 7.4 High severity
- 7.1 High severity
- 7.8 High severity
- 7.3 High severity
- 7.3 High severity
Recent Logging of Excessive Data vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
- 7.5 High severity
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