# CVE-2026-62915: Microsoft Exchange Server missing authorization security feature bypass

Source: https://junglewise.ai/threats/cve-2026-62915-microsoft-exchange-server-missing-authorization-security-feature  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-11. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-62915 · Severity: medium · CVSS 6.5 · Published 2026-08-11

Microsoft Exchange Server, a critical email and collaboration platform used by organizations worldwide, contains a missing authorization check that allows an authenticated attacker to bypass an intended security feature. An attacker with valid Exchange credentials could exploit this vulnerability to circumvent security controls, potentially leading to unauthorized access to email or other protected resources within the organization.

Technologies: [Microsoft Exchange Server](https://junglewise.ai/threats/technologies/exchange-server). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-62915 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-62915 being exploited in the wild.

**How severe is CVE-2026-62915?** Medium severity, with a CVSS score of 6.5, published 11 August 2026.

**Which products and versions are affected?** Microsoft Exchange Server.

**Is there a fix for CVE-2026-62915?** 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-2026-62915 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-62915?** Check whether you run Microsoft Exchange Server. 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

This vulnerability is a missing authorization flaw in Microsoft Exchange Server that allows an authenticated attacker to bypass a security feature over the network. The root cause is insufficient authorization validation in the affected component, enabling an attacker with valid credentials to perform actions that should be restricted by security controls. The attack requires network access and valid authentication credentials, but does not appear to require elevated privileges or user interaction. An attacker can exploit this to circumvent intended security restrictions, potentially accessing email or other protected data. A patch from Microsoft should be available through their regular security updates.

## Affected products

- Microsoft Exchange Server

## Timeline

- 2026-08-11: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62915](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62915)

## Related threats

- [Microsoft Exchange Server improper access control spoofing](https://junglewise.ai/threats/cve-2026-118208-improper-access-control-in-microsoft-exchange-server-allows-an)
- [Microsoft Exchange Server improper input validation code execution](https://junglewise.ai/threats/cve-2026-118207-improper-input-validation-in-microsoft-exchange-server-allows-an)
- [Microsoft Exchange Server weak authentication privilege elevation](https://junglewise.ai/threats/cve-2026-118157-weak-authentication-in-microsoft-exchange-server-allows-an)
- [Microsoft Exchange Server privilege elevation via untrusted security decision input](https://junglewise.ai/threats/cve-2026-118154-reliance-on-untrusted-inputs-in-a-security-decision-in-microsoft)
- [Microsoft Exchange Server algorithmic complexity denial of service](https://junglewise.ai/threats/cve-2026-118153-inefficient-algorithmic-complexity-in-microsoft-exchange-server)