CVE-2026-109952
Description
A flaw was found in FreeRDP. A remote attacker, acting as a malicious server or an on-path attacker, can exploit this flaw to cause information disclosure by intercepting user credentials in cleartext. Due to missing validation during connection negotiation, the client accepts unapproved security protocols selected by the server, bypassing configured protections like Network Level Authentication (NLA). Consequently, the connection downgrades to a less secure protocol and transmits the user's password in plain text.
Statement
This flaw is rated Moderate because algorithm downgrade/selection weakness may allow disclosure under complex conditions (AC:H) when connecting to a malicious peer (UI:R).
Mitigation
Restrict FreeRDP clients to trusted RDP servers and networks.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | 5.3 | 5.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | High |
| Privileges Required | None | None | None |
| User Interaction | Required | Required | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | None | None | None |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Red Hat CVSS v3 Score Explanation
Red Hat CVSS reflects FreeRDP exposure after applying client/server interaction model. Score 5.3 maps to MODERATE.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
When a security mechanism can be forced to downgrade to use a less secure algorithm, this can make it easier for attackers to compromise the product by exploiting the weaker algorithm. The victim might not be aware that the less secure algorithm is being used. For example, if an attacker can force a communications channel to use cleartext instead of strongly-encrypted data, then the attacker could read the channel by sniffing, instead of going through extra effort of trying to decrypt the data using brute force techniques.
Frequently Asked Questions
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