Qlik flaws being used in attacks

CISA lists 3 flaws in Qlik products as being used in attacks, most recently on 13 Jan 2025. All have been used in ransomware.

What to do

1. Update every Qlik product you use.Install the updates Qlik offers, on every device, and restart when asked. Each flaw below has a fix or clear advice; that’s one of CISA’s conditions for listing it.
2. If someone looks after IT for you, send them this page.Many of these are in equipment you don’t see: routers, firewalls, servers, the office network. Ask them to confirm each one is fixed, or that you don’t use the product.
3. Check anything else in the lookup.Search any app, company or CVE. Not being on CISA’s list doesn’t mean safe: keep updating either way.

Every flaw, newest first

1. Being used in attacksUsed in ransomwareAdded by CISA on 13 Jan 2025
   Qlik Sense
   CVE-2023-48365Qlik Sense HTTP Tunneling Vulnerability
   Qlik Sense contains an HTTP tunneling vulnerability that allows an attacker to escalate privileges and execute HTTP requests on the backend server hosting the software.
   CISA’s required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
   CVE recordNVD
2. Being used in attacksUsed in ransomwareAdded by CISA on 7 Dec 2023
   Qlik Sense
   CVE-2023-41266Qlik Sense Path Traversal Vulnerability
   Qlik Sense contains a path traversal vulnerability that allows a remote, unauthenticated attacker to create an anonymous session by sending maliciously crafted HTTP requests. This anonymous session could allow the attacker to send further requests to unauthorized endpoints.
   CISA’s required actionApply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
   CVE recordNVD
3. Being used in attacksUsed in ransomwareAdded by CISA on 7 Dec 2023
   Qlik Sense
   CVE-2023-41265Qlik Sense HTTP Tunneling Vulnerability
   Qlik Sense contains an HTTP tunneling vulnerability that allows an attacker to escalate privileges and execute HTTP requests on the backend server hosting the software.
   CISA’s required actionApply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
   CVE recordNVD

From CISA’s Known Exploited Vulnerabilities catalog, updated 21 Oct 2026 (version 2026.10.21). CISA’s required actions are written for US government agencies. Qlik on CISA’s site.