CVE-2026-54893 Email-derived URL path injection in the Swoosh Microsoft Graph adapter
Attackers can inject URL characters into email addresses to redirect Microsoft Graph API requests, potentially accessing or modifying data within token scopes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54893?
CVE-2026-54893 is a low-severity server-side request forgery vulnerability in swoosh, published on 6 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
URL path injection in the Microsoft Graph adapter of Swoosh. Swoosh.Adapters.MsGraph builds its Microsoft Graph API request URL by interpolating the sender's email address into the URL path (/users/{from}/sendMail) without percent-encoding or validation.
In applications that derive the from address from untrusted or user-influenced input (for example a relay, a contact form, or a "send as" feature), an attacker can place URL-special characters such as /, ?, or # in the local part of the address to escape the intended path segment and rewrite the path and query string of the request. Because the same authenticated POST is sent with the application's Microsoft Graph bearer token, the attacker can redirect it to other Graph endpoints within the token's scopes and control the request's query string. Applications that always use a fixed, trusted from address are not affected.
This issue affects swoosh: from 1.12.0 before 1.26.3.
Weakness: CWE-116
Which versions are affected by CVE-2026-54893?
3 open source packages ship an affected version, including swoosh.
| Package | Affected | Fixed in |
|---|---|---|
swoosh Hex | From 1.12.0 | 1.26.3 |
swoosh Hex | From 1.12.0 | 1.26.3 |
swoosh Hex | From 1.12.0 | 1.26.3 |
How do I fix CVE-2026-54893?
Upgrade swoosh to 1.26.3 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-54893 being exploited?
There is no known exploitation of CVE-2026-54893 in the wild and no public exploit code.
Sources
Also known as EEF-CVE-2026-54893, GHSA-754j-98wh-57rf.