ZeroQlik HTTP Request Tunneling in Qlik Sense Enterprise for Windows
CVE-2023-41265 is an HTTP request tunneling/request smuggling vulnerability in Qlik Sense Enterprise for Windows. According to the provided content, the issue exists in the Qlik proxy’s request forwarding logic, where the proxy prioritizes Content-Length while also forwarding Transfer-Encoding, creating a parsing discrepancy with backend services. This allows a remote attacker to tunnel a second HTTP request inside the raw HTTP request body so that the backend repository service processes attacker-controlled requests that were not intended to be exposed through the proxy’s normal security model. The vulnerability can bypass proxy header restrictions and enable impersonation of trusted internal identities by smuggling requests that include privileged X-Qlik-* headers, including X-Qlik-User. In practice, the backend repository service trusts these headers on the proxy-to-backend channel, so successful exploitation can elevate privileges and, when combined with reachable privileged repository APIs such as /qrs/externalprogramtask, can lead to arbitrary command execution. The content also notes this flaw is commonly discussed together with CVE-2023-41266 and referred to as ZeroQlik in public reporting.
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Impact
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Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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Affected products & vendors
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Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Qlik Sense exploited by Cactus ransomware for initial access.
A Qlik Sense vulnerability known as ZeroQlik that is discussed as part of the exploit chain used by the Cactus ransomware group.
A specific vulnerability affecting Qlik Sense Enterprise for Windows referenced in a vendor advisory and linked to reporting about exploitation.
A specific vulnerability affecting Qlik Sense Enterprise for Windows that is referenced in vendor advisories and linked to reporting on exploitation.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.