None severity · published Jun 23, 2026
CVE-2026-44961
The XML‑RPC API addUser method has a validation bypass introduced in the fix for CVE‑2025‑55129
0.0
CVSS
0.4%
EPSS
No
On KEV
Description
The XML‑RPC API addUser method has a validation bypass introduced in the fix for CVE‑2025‑55129. As a result, API users could create usernames that enabled impersonation or stored XSS attacks. Proper validation has been added where it was missing.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AD
Adserver · Revive
through 6.0.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44961
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44961
hackerone.com
https://hackerone.com/reports/3680090
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