CVE-2026-84850

TLS interception via improper certificate validation

Published Sep 15, 2026 · Updated Sep 15, 2026

Improper certificate validation in Devolutions Server 2026.2.16 and earlier allows man-in-the-middle attackers to tamper with outbound TLS traffic. The shared HTTP client used by synchronization and integration features accepts spoofed or self-signed certificates instead of rejecting an untrusted peer. Exploitation requires a network position on an affected outbound connection and permits interception or modification of data exchanged with the destination.

CVSS severityUnavailable
Unscored
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Devolutions Server 2026.2.16 and earlier allows man-in-the-middle attackers to tamper with outbound TLS traffic. The shared HTTP client used by synchronization and integration features accepts spoofed or self-signed certificates instead of rejecting an untrusted peer. Exploitation requires a network position on an affected outbound connection and permits interception or modification of data exchanged with the destination.

The record

CVE
CVE-2026-84850
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Ironman Software
Product
Devolutions Server
Classifications
CWE-295, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2026.2.16

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Ironman Software · Devolutions Serverversion=0 <=2026.2.16

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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