ZeroQlik HTTP Request Tunneling in Qlik Sense Enterprise for Windows
CVE-2023-41265 is an HTTP request tunneling/smuggling vulnerability in Qlik Sense Enterprise for Windows. The issue affects versions May 2023 Patch 3 and earlier, February 2023 Patch 7 and earlier, November 2022 Patch 10 and earlier, and August 2022 Patch 12 and earlier. According to the provided analysis, the Qlik proxy forwards requests to backend services using parsing logic that prioritizes Content-Length while also forwarding Transfer-Encoding, creating a proxy/backend parsing discrepancy. This allows a remote attacker to tunnel or smuggle a second HTTP request inside the raw HTTP request stream so that it is processed by the backend repository service rather than being fully mediated by the front-end proxy. Because backend services trust proxy-injected X-Qlik-* identity headers on the internal channel, successful tunneling can bypass proxy header restrictions and enable impersonation of privileged internal identities such as sa_repository. In reported research, this primitive was used to reach repository APIs and, when chained with related access-control weaknesses, to perform privileged administrative actions and ultimately achieve code execution via creation of external program tasks.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 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 named Qlik Sense vulnerability, also called ZeroQlik, 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.
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.