VulnerabilityPublished 1 Apr 2026

CVE-2026-4829: Devolutions Server · Improper Authentication

Affects Devolutions ServerSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

5.4Medium

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
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: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 1 Apr 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

Affected software

Product	Affected	Fixed in
DevolutionsServer	Affected <=2026.1.11	Fixed in–

AI-suggested

To mitigate CVE-2026-4829, organizations should implement the following specific measures: 1) Monitor Devolutions Server environments for unusual authentication patterns, especially reuse of OAuth session codes or unexpected privilege escalations. 2) Restrict OAuth session code lifetimes and enforce strict single-use policies to prevent reuse. 3) Apply principle of least privilege to limit the number of users with administrative rights, reducing the impact of potential impersonation. 4) Implement multi-factor authentication (MFA) on all accounts, particularly administrators, to add an additional layer of security beyond OAuth tokens. 5) Once a patch or update is released by Devolutions, prioritize immediate deployment to remediate the vulnerability. 6) Review and harden OAuth integration configurations, ensuring tokens and session codes are securely validated and invalidated after use. 7) Conduct regular security audits and penetration tests focusing on authentication flows to detect similar weaknesses. 8) Educate users about the risks of session reuse and ensure secure session management practices are followed. These steps go beyond generic advice by focusing on OAuth session code management and administrative privilege controls specific to this vulnerability.

Description

Improper authentication in the external OAuth authentication flow in Devolutions Server 2026.1.11 and earlier allows an authenticated user to authenticate as other users, including administrators, via reuse of a session code from an external authentication flow.

Impact

The primary impact of CVE-2026-4829 is unauthorized privilege escalation within Devolutions Server environments. An attacker who is already authenticated can impersonate other users, including administrators, thereby gaining elevated privileges without needing to compromise additional credentials. This can lead to unauthorized access to sensitive systems, data exfiltration, manipulation of privileged credentials, and disruption of access controls. Organizations relying on Devolutions Server for managing privileged accounts and remote access are at risk of having their administrative controls undermined, potentially leading to widespread compromise of internal networks. The vulnerability threatens confidentiality by exposing sensitive credentials and session tokens, and integrity by allowing unauthorized changes to configurations and access policies. Availability could also be indirectly affected if attackers disable or lock out legitimate administrators. Given the critical role of privileged access management in cybersecurity, exploitation could facilitate further lateral movement and persistence by attackers within targeted networks.

CWE-287Improper Authentication (opens in a new tab)
Class weaknessLikelihood of exploit: HighOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Libraries or Frameworks
Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V2.8.5 (opens in a new tab)
V2.8.4 (opens in a new tab)
V9.2.3 (opens in a new tab)
Attack patterns
Fake the Source of Data (opens in a new tab)
Utilizing REST's Trust in the System Resource to Obtain Sensitive Data (opens in a new tab)
Session Hijacking (opens in a new tab)
Token Impersonation (opens in a new tab)
Upload a Web Shell to a Web Server (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

devolutions.net/security/advisories/DEVO-2026-0010 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 1 Apr 2026, 15:40 UTC

WeaknessesCWE-287

Technical details

References

Community reviews

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