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CVE-2026-44961 is an incomplete input validation vulnerability in Revive Adserver affecting versions 6.0.6 and earlier. In the XML-RPC API addUser method, validation rules that had been introduced as part of the fix for CVE-2025-55129 were bypassed or missing, allowing API users to create usernames that should have been rejected. By supplying crafted usernames through addUser, an attacker could register values that enable impersonation scenarios or act as a stored XSS payload when the username is later rendered in administrative or audit contexts.
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What an attacker gets, and what they’ve been doing with it.
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addUser method, to trusted administrators and tightly controlled sources only. Review and monitor recently created usernames for suspicious or malformed values, and reduce exposure of administrative views that render username data until the vendor fix is applied. No specific vendor workaround beyond limiting API access is provided in the available content.Patch, then assume compromise.
addUser validation bypass introduced after CVE-2025-55129.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.