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CVE-2026-66842 is a control-plane vulnerability in the F5 BIG-IP Traffic Management User Interface (TMUI). An authenticated user assigned any role may be able to submit an undisclosed TMUI request that creates administrative user accounts. The issue affects the BIG-IP management interface and is not reported to expose the data plane.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authenticated privilege-escalation vulnerability in F5 BIG-IP Traffic Management User Interface (TMUI) that may allow any authenticated management-interface user, regardless of role, to create administrative accounts. It affects the control plane only and has no data-plane exposure.
An authenticated privilege-escalation vulnerability in F5 BIG-IP's Traffic Management User Interface (TMUI). A network-accessible user authenticated with any role on the BIG-IP management interface may be able to create administrative accounts, resulting in total compromise of confidentiality, integrity, and availability on the control plane. The content states there is no data-plane exposure.
A network-accessible F5 BIG-IP vulnerability requiring low privileges and no user interaction, with high impacts to confidentiality, integrity, and availability according to the supplied CVSS vectors.
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.