# CVE-2026-14440: Cloudflare Universal SSL CAA enforcement bypass

Source: https://junglewise.ai/threats/cve-2026-14440-cloudflare-universal-ssl-caa-enforcement-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

CVE-2026-14440 · Severity: info · CVSS 7.6 · Published 2026-07-01

Cloudflare's Universal SSL feature, which automatically manages security certificates for websites, contains a configuration flaw that can bypass certain advanced security restrictions set by customers. Specifically, if a customer tries to limit certificate issuance to a specific account or validation method, Cloudflare's automated system may override these settings with more permissive ones. This could theoretically allow a sophisticated attacker to obtain a fraudulent security certificate for a customer's domain, potentially allowing them to intercept or spoof encrypted web traffic.

Vendors: [Cloudflare](https://junglewise.ai/threats/vendors/cloudflare).

## Quick answers

**Is CVE-2026-14440 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-14440 being exploited in the wild.

**How severe is CVE-2026-14440?** Informational severity, with a CVSS score of 7.6, published 1 July 2026.

**Which products and versions are affected?** Cloudflare Universal SSL All versions prior to July 2026.

**Is there a fix for CVE-2026-14440?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-14440 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-14440?** Check whether you run Cloudflare Universal SSL 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

Cloudflare's Universal SSL feature automatically manages Certificate Authority Authorization (CAA) Resource Record Sets (RRsets) for customer zones. This auto-managed RRset is designed to be permissive and takes precedence over customer-configured CAA records at query time. Consequently, when a customer attempts to implement stricter controls using RFC 8657 parameters (such as 'accounturi' or 'validationmethods'), these constraints are not observed by the Certificate Authority because the Cloudflare-served RRset lacks them. An attacker who controls an ACME account at a permitted CA and can satisfy domain control validation requirements could potentially obtain a browser-trusted certificate for the target domain. Mitigation requires disabling Universal SSL for zones where strict RFC 8657 enforcement is necessary.

## Affected products

- Cloudflare Universal SSL All versions prior to July 2026

## Timeline

- 2026-07-01: disclosed: Vulnerability disclosed by Cloudflare and assigned CVE-2026-14440.

## References

- [https://developers.cloudflare.com/ssl/edge-certificates/caa-records/](https://developers.cloudflare.com/ssl/edge-certificates/caa-records/)
- [https://developers.cloudflare.com/ssl/edge-certificates/universal-ssl/limitations/](https://developers.cloudflare.com/ssl/edge-certificates/universal-ssl/limitations/)
- [https://www.rfc-editor.org/rfc/rfc8657](https://www.rfc-editor.org/rfc/rfc8657)
- [https://www.rfc-editor.org/rfc/rfc8659](https://www.rfc-editor.org/rfc/rfc8659)