Quick answers
- Is CVE-2026-114490 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-114490 being exploited in the wild.
- How severe is CVE-2026-114490?
- High severity, with a CVSS score of 7.8, published 21 October 2026.
- Which products and versions are affected?
- Progressive Robot hMailServer 6.3.4 through 6.3.6.
- Is there a fix for CVE-2026-114490?
- Yes: fixed in 6.3.7. Until then: Until upgrading, do not assign the serveradmin role with a list of domains to any account that must be confined to those domains. Instead, assign a custom role with only necessary permissions and a domain list, or assign the domainadmin role with a domain list that includes the account's own domain. Audit all current role assignments in the Control Panel or via REST API to identify any serveradmin accounts with restricted domain lists. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-114490 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-114490?
- Check whether you run Progressive Robot hMailServer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 6.3.7
Until upgrading, do not assign the serveradmin role with a list of domains to any account that must be confined to those domains. Instead, assign a custom role with only necessary permissions and a domain list, or assign the domainadmin role with a domain list that includes the account's own domain. Audit all current role assignments in the Control Panel or via REST API to identify any serveradmin accounts with restricted domain lists.
Technical details
Incorrect authorization logic in the COM administration API allowed accounts assigned the serveradmin role with a restricted domain list to be treated as unrestricted server administrators. The vulnerability stems from the RoleManager::Allows() function reading the administer_server permission without considering the domain restriction list, while the REST API correctly enforced this restriction. An authenticated local attacker with a restricted credential can sign in over COM (via Control Panel or server-side scripts) and execute arbitrary administrative operations including reading/modifying all domains' accounts and mailboxes, renaming domains, and creating additional server-administrator accounts.
Affected products
- Progressive Robot hMailServer 6.3.4 through 6.3.6
Timeline
- 2026-10-21: disclosed
- 2026-10-21: patched: Fixed in v6.3.7