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DoubleQlik is an unauthenticated HTTP tunneling remote code execution vulnerability in Qlik Sense Enterprise for Windows, tracked internally as QB-21683. Improper validation of HTTP headers allows a remote attacker to tunnel requests to the backend server hosting the repository application, bypass security restrictions, and execute arbitrary code with backend permissions. The vulnerability bypasses an incomplete fix for CVE-2023-41265 and affects multiple release branches before their corresponding security patches.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Qlik Sense Enterprise involving HTTP tunneling.
A Qlik vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
A bypass of an incomplete mitigation for the Qlik Sense vulnerabilities, known as DoubleQlik. The article identifies ZeroQlik and/or DoubleQlik exploitation as the initial-access mechanism in Cactus ransomware incidents, enabling arbitrary commands under the Qlik Sense service account. Attribution to this specific CVE remains uncertain because the available logs cannot distinguish the exploit routes.
A high-severity HTTP tunneling vulnerability in Qlik Sense Enterprise for Windows, allowing privilege escalation and remote exploitation.
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.