Which products and versions are affected by CVE-2019-11634?

Affected: Receiver (Citrix) versions 4.9-cumulative_update_6; Workspace (Citrix). The full list is in the CVE brief.

Is CVE-2019-11634 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 26, 2021 and is known to be used in ransomware campaigns.

Is CVE-2019-11634 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.

Is there a public exploit for CVE-2019-11634?

Public exploit code is available.

Is there a fix for CVE-2019-11634?

Fixed versions are available, including Workspace 1904.

How urgently should CVE-2019-11634 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2019-11634

CriticalExploitedPublic exploit

Citrix Workspace App before 1904 for Windows has Incorrect Access Control.

Published May 22, 2019 · Updated Aug 12, 2026

Key Facts

Patch immediately

CVE-2019-11634 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Receiver (Citrix), Workspace (Citrix).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 26, 2021 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 8.1% probability of exploitation in the next 30 days.
Fixed versions are available, including Workspace 1904.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

8.1%

Higher than 94.7% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2019-11634 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Citrix Workspace App before 1904 for Windows has Incorrect Access Control.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	May 3, 2022	Known
Industry KEV feed	Jan 26, 2021	May 3, 2022	Known
CIRCL KEV	Nov 3, 2021	May 3, 2022	Known
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
ReceiverCitrix	4.9-cumulative_update_6	n/a
WorkspaceCitrix	See advisory	1904

Patched Releases

Workspace

1904

Timeline

Publicly disclosed
May 22, 2019
Added to Industry KEV feed
Jan 26, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Aug 12, 2026

Weakness Type

CWE-284 Improper Access Control

References

4 more references in the full CVE brief

FAQ

Common Questions.

Citrix Workspace App before 1904 for Windows has Incorrect Access Control.
Affected: Receiver (Citrix) versions 4.9-cumulative_update_6; Workspace (Citrix). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 26, 2021 and is known to be used in ransomware campaigns.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including Workspace 1904.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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