# 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.

- **Severity:** Low 2.1 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Jul 2026
- **Updated:** 24 Sep 2026
- **Also known as:** EEF-CVE-2026-54893, GHSA-754j-98wh-57rf

## 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 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-54893?

3 open source packages ship an affected version, including swoosh.


| Package | Ecosystem | 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.

## Is CVE-2026-54893 being exploited?

There is no known exploitation of CVE-2026-54893 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54893 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-54893 in the wild and no public exploit code.

Affected packages and fixed versions:
- swoosh (Hex): affected from 1.12.0; fixed in 1.26.3
- swoosh (Hex): affected from 1.12.0; fixed in 1.26.3
- swoosh (Hex): affected from 1.12.0; fixed in 1.26.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54893/ (Markdown: https://insights.sbomify.com/CVE-2026-54893/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54893
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54893
- OSV: https://osv.dev/vulnerability/CVE-2026-54893

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54893/
Summaries are generated and may contain mistakes; the official description above is the record.