# CVE-2026-100720: Froxlor stored cross-site scripting in SSL certificate issuer

Source: https://junglewise.ai/threats/cve-2026-100720-froxlor-2-0-0-through-2-3-10-is-vulnerable-to-stored-cross-site  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-26. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-100720 · Severity: high · CVSS 8.7 · Published 2026-09-26

Froxlor is a web hosting control panel that manages domains, SSL certificates, and server configuration. A low-privileged customer can upload a malicious SSL certificate with crafted issuer information that executes JavaScript when an administrator views the certificate list, leading to complete administrator account takeover and potential root-level command execution on the managed server.

Technologies: [Froxlor](https://junglewise.ai/threats/technologies/froxlor). Vendors: [Froxlor](https://junglewise.ai/threats/vendors/froxlor).

## Quick answers

**Is CVE-2026-100720 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100720 being exploited in the wild.

**How severe is CVE-2026-100720?** High severity, with a CVSS score of 8.7, published 26 September 2026.

**Which products and versions are affected?** Froxlor 2.0.0 through 2.3.10.

**Is there a fix for CVE-2026-100720?** 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-2026-100720 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-100720?** 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

Stored XSS in Froxlor's certificate management where the Certificates API stores the issuer organization field from parsed SSL certificates without sanitization, and the table-listing renderer outputs this field through Twig's raw filter, bypassing HTML escaping. A customer with domain management access can upload self-signed certificates with attacker-controlled issuer values that execute as JavaScript in an administrator's session; the vulnerability requires an authenticated customer account and admin interaction (viewing the SSL certificates page), but enables privilege escalation from customer to admin and further to root via cron-executed configuration changes. A fix is available in version 2.3.12.

## Affected products

- Froxlor Froxlor 2.0.0 through 2.3.10

## Timeline

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

## References

- [https://github.com/froxlor/froxlor/security/advisories/GHSA-89vj-gqqr-73p8](https://github.com/froxlor/froxlor/security/advisories/GHSA-89vj-gqqr-73p8)
- [https://www.vulncheck.com/advisories/froxlor-before-2.3.12-stored-xss-via-ssl-certificate-issuer](https://www.vulncheck.com/advisories/froxlor-before-2.3.12-stored-xss-via-ssl-certificate-issuer)

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