VulnerabilityPublished 5 Mar 2026

CVE-2026-28726: Acronis Cyber Protect 17 · Incorrect Authorization

Affects Acronis Cyber Protect 17Source CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium : upgrade to 41186 when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.0 base score

4.3Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% 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:L/UI:N/S:U/C:L/I:N/A:N

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

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: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within 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 29 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

1. 2. In the interim, restrict network access to Acronis Cyber Protect 17 management interfaces to trusted administrators only, using network segmentation and firewall rules. 3. Review and tighten user privilege assignments within Acronis Cyber Protect 17 to ensure that only necessary users have access, minimizing the attack surface. 4. Implement strong authentication mechanisms, such as multi-factor authentication, to reduce the risk of unauthorized access by low-privilege users. 5. Conduct regular audits of access logs and user activities to detect any anomalous or unauthorized attempts to access sensitive information. 6. Employ intrusion detection and prevention systems to monitor for suspicious network activity targeting the affected product. 7. Educate administrators about the risks of improper access control and encourage adherence to the principle of least privilege. 8. Consider temporary compensating controls such as disabling non-essential services or features that expose sensitive data until a patch is applied.

Description

Sensitive information disclosure due to improper access control. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 41186.

Impact

The primary impact of CVE-2026-28726 is the unauthorized disclosure of sensitive information, which can compromise confidentiality within affected organizations. Since Acronis Cyber Protect 17 is used for backup and cybersecurity management, exposure of sensitive data could include backup configurations, credentials, or security policies, potentially enabling attackers to escalate privileges or plan further attacks. Although integrity and availability are not directly affected, the confidentiality breach can lead to secondary impacts such as targeted attacks, data exfiltration, or compliance violations. Organizations worldwide using this product may face increased risk of data leakage, especially if attackers gain low-privilege access to the system. The medium severity rating suggests a moderate risk level, but the ease of network-based exploitation with no user interaction required increases the urgency of mitigation. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability details are public. Enterprises relying heavily on Acronis Cyber Protect 17 for critical backup and security operations could experience operational disruptions if sensitive information is leaked and leveraged by adversaries.

CWE-863Incorrect Authorization (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #17OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Architecture and Design
Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Architecture and Design
Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

security-advisory.acronis.com/advisories/SEC-8401 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Mar 2026, 19:53 UTC

WeaknessesCWE-863

Technical details

References

Community reviews

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