Is CVE-2026-100718 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100718 being exploited in the wild.

How severe is CVE-2026-100718?

High severity, with a CVSS score of 7.1, published 26 September 2026.

Is there a fix for CVE-2026-100718?

A patch was published on 2026-09-26: Fixed in version 2.3.12 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-100718 attacked?

It is attacked over the network.

Am I affected by CVE-2026-100718?

Check whether you run Froxlor 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.

CVE-2026-100718: Froxlor API policy bypass in EmailSender.add

CVE-2026-100718 · Severity: high · CVSS 7.1 · Published 2026-09-26

Froxlor is a hosting control panel that manages email accounts and sender authentication policies. In versions through 2.3.10, the EmailSender.add API command fails to enforce the administrator's restriction on external sender domains, allowing a customer with API access to register arbitrary sender addresses outside their hosted domains. This enables sender spoofing and circumvents email security policies the administrator explicitly configured.

Technologies: Froxlor. Vendors: Froxlor.

Quick answers

Is CVE-2026-100718 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100718 being exploited in the wild.
How severe is CVE-2026-100718?: High severity, with a CVSS score of 7.1, published 26 September 2026.
Which products and versions are affected?: Froxlor through 2.3.10.
Is there a fix for CVE-2026-100718?: A patch was published on 2026-09-26: Fixed in version 2.3.12 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-100718 attacked?: It is attacked over the network.
Am I affected by CVE-2026-100718?: Check whether you run Froxlor 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.

Technical details

The vulnerability is an authorization bypass (CWE-276) where the EmailSender.add API endpoint does not validate the mail.allow_external_domains policy setting before accepting external sender identities. An authenticated customer with API access can add external sender addresses to their mailbox despite the global policy mail.allow_external_domains = 0 being set. The fix is available in version 2.3.12.

Affected products

Froxlor Froxlor through 2.3.10

Timeline

2026-09-26: disclosed
2026-09-26: patched: Fixed in version 2.3.12

References

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