Security readout for executives and security teams
Plain-English summary
This CVE affects Citrix Workspace App for Windows versions before 1904. The available sources describe an incorrect access control issue with critical CVSS severity. Because CISA lists it in KEV, organizations should treat legacy installations as a real-world exposure, not just a theoretical weakness.
Executive priority
Treat as urgent for organizations with Citrix Workspace App on Windows. Critical severity and KEV listing justify rapid endpoint inventory and remediation, especially where Citrix clients support remote access or privileged business workflows.
Technical view
CVE-2019-11634 is a CWE-284 incorrect access control flaw in Citrix Workspace App before 1904 for Windows. The CVSS 3.1 vector is network-accessible, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact. Public source detail is sparse.
Likely exposure
Exposure is likely on Windows endpoints running Citrix Workspace App versions earlier than 1904. The bundle does not identify affected CPEs or non-Windows products, so do not expand scope beyond Citrix Workspace App for Windows without vendor confirmation.
Exploitation context
CISA KEV status indicates this vulnerability has been known exploited. The provided sources do not include exploit timing, threat actor attribution, attack path detail, or prevalence data.
Researcher notes
The public bundle confirms product, version boundary, CWE, CVSS, and KEV status, but provides limited technical root-cause detail. Avoid assuming affected server products or exploitation mechanics from this record alone.
Mitigation direction
- Inventory Citrix Workspace App for Windows versions across managed endpoints.
- Upgrade installations earlier than 1904 per Citrix advisory CTX251986.
- Prioritize internet-exposed, remote-work, and privileged-user endpoints first.
- Check Citrix guidance for any additional vendor-specific mitigations.
- Remove unsupported legacy Workspace App versions where upgrade is not possible.
Validation and detection
- Confirm endpoint software inventory reports Citrix Workspace App version 1904 or later.
- Review vulnerability scanner detections against CVE-2019-11634.
- Check CISA KEV tracking for remediation deadlines and operational priority.
- Validate that no unmanaged Windows clients retain pre-1904 versions.
- Document exceptions with owner, reason, and compensating controls.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-11634 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.citrix.com/v1/search?searchQuery=%22%22&lang=en&sort=cr_date_desc&prod=&pver=&ct=Security+BulletinCVE reference · x_refsource_MISC
- https://support.citrix.com/article/CTX251986CVE reference · x_refsource_CONFIRM
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11634CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.