VulnerabilityPublished 5 Mar 2026Updated 9 Mar 2026

CVE-2026-28718: Acronis Cyber Protect 17 · CWE-779

Affects Acronis Cyber Protect 17Source CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 41186 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 29% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 41186

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Acronis Cyber Protect 17 to 41186.

Affected software

Product	Affected	Fixed in
AcronisAcronis Cyber Protect 17	Affected ≥ unspecified, < 41186	Fixed in 41186

AI-suggested

Upgrade Acronis Cyber Protect 17 to build 41186 or later as soon as the patch is available from the vendor to remediate the vulnerability.
If you cannot patch yet, restrict network access to the Acronis Cyber Protect management interfaces and authentication services to trusted IP addresses only, minimizing exposure to potential attackers.
Implement network-level protections such as firewalls and intrusion detection/prevention systems (IDS/IPS) to monitor and block suspicious traffic targeting authentication logging endpoints.
Enable detailed monitoring and alerting on authentication logs and service availability to detect anomalies or service interruptions early.
Conduct regular backups and verify their integrity to ensure recovery capability in case of service disruption.
Review and harden logging configurations to ensure input validation and error handling are robust, and consider applying additional application-layer filtering if possible.
Engage with Acronis support for guidance and to receive timely updates on patches and mitigations.
Incorporate this vulnerability into organizational risk assessments and incident response plans to prepare for potential exploitation scenarios.

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.

Impact

The primary impact of CVE-2026-28718 is a denial of service condition affecting the availability of Acronis Cyber Protect 17 services. This can lead to interruption of backup and cybersecurity operations, potentially leaving systems unprotected or without recent backups during the downtime. For organizations relying heavily on Acronis Cyber Protect for data protection and threat prevention, such disruption could increase recovery time objectives (RTOs) and expose them to greater risk from other threats. Although the vulnerability does not compromise confidentiality or integrity, the loss of availability in security-critical infrastructure can have cascading effects, including delayed incident detection and response. The ease of exploitation (no authentication or user interaction required) and network accessibility increase the risk profile. However, the lack of known exploits in the wild and the medium CVSS score suggest the threat is moderate but should not be underestimated, especially in environments with high dependency on Acronis Cyber Protect. Organizations with regulatory or compliance requirements for continuous data protection may face additional operational and legal risks if this vulnerability is exploited.

CWE-779Logging of Excessive Data (opens in a new tab)
Base weaknessLikelihood of exploit: Low
The product logs too much information, making log files hard to process and possibly hindering recovery efforts or forensic analysis after an attack.
Architecture and Design
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.
Architecture and Design
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.
Implementation
Adjust configurations appropriately when the product is transitioned from a debug state to production.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

security-advisory.acronis.com/advisories/SEC-8377 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Mar 2026, 19:43 UTC

WeaknessesCWE-779

Technical details

References

Community reviews

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