CVE-2026-110838Suited to automated attack · CISA

FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass

CVSS score

8.7

EPSS probability

%0.3

Risk score

0.0

Published

4 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

A patch is available only for some products or versions

Kanıt listesindeki ürün ve sürüm eşleşmesini kontrol edin; bazı varyantlar hâlâ etkileniyor olabilir.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

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Vulnerability description

CVE AI research

The stored explanation is shown at once; refreshing evaluates the sources again.

DayBreach AI Explanation

Verified against sources

CVE-2026-110838: FreeRDP Shadow Server Pre-Authentication Input Injection

Sources read

Source agreement

0/2

Evidence confidence

%47

Short explanation

FreeRDP shadow server versions 3.0.0 before 3.32.0 dispatch input PDUs prior to authentication, allowing unauthenticated attackers to inject keyboard input.

Why does it matter?

Unauthenticated attackers can inject synthetic keystrokes into target user sessions over the network, leading to integrity compromise.

What should be done?

Follow vendor advisories
Update affected versions

Note on uncertainty

2 alanda kaynak uyuşmazlığı var. DayBreach bu değerleri saklamadı; kaynak karşılaştırması aşağıda gösteriliyor.

Chain of evidence and sources2 verified claims

FreeRDP shadow sunucusu 3.0.0 ile 3.32.0 sürümleri arasında kimlik doğrulama öncesi girdi PDU'larını işler.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Saldırganlar XTEST kullanarak X11 oturumuna yapay tuş vuruşları enjekte edebilir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

FreeRDP shadow server from 3.0.0 before 3.32.0 dispatches input PDUs during the Confirm Active state before authentication, allowing unauthenticated attackers to inject keyboard input. Attackers can negotiate TLS-only RDP and send an input PDU without Confirm Active to inject synthetic keystrokes into the host user's X11 session via XTEST.

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CWE: CWE-306

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-110838 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	freerdp	freerdp	View
2	debian	freerdp2 (bookworm)	View
3	debian	freerdp3 (sid)	View
4	debian	freerdp3 (forky)	View
5	debian	freerdp3 (trixie)	View

Total affected vendors: 2|Products: 5

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.7	CVSS V40	HIGH	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD
8.7	CVSS V4_0	HIGH	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	CVE CNA
7.5	CVSS V31	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	NVD
7.5	CVSS V3_1	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Partial patch

2 düzeltme kanıtı bulundu; en az 2 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

debianfreerdp3 (sid)3.32.0+dfsg-1

Debian sid: 3.32.0+dfsg-1

debianfreerdp3 (forky)3.32.0+dfsg-1

Debian forky: 3.32.0+dfsg-1

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-110838 is associated with the following CWEs:

CWE-306: Common Weakness Enumeration Entry CWE-306

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-110838 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

GitHub Security Advisory (GHSA-m998-cvfm-9444)vendor-advisory VulnCheck Advisory: FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypassvendor-advisory https://security-tracker.debian.org/tracker/CVE-2026-110838vendor-advisory

CVSS Vector Radar Chart

8.7 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)None

Kısmi yama

2 düzeltme kanıtı bulundu; en az 2 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

Follow the vendor

freerdp

debian

Weakness Type (CWE & CAPEC)

CWE-306

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