---
id: CVE-2026-54893
title: URL path injection in the Microsoft Graph adapter of Swoosh
summary: >-
  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-encodi…
severity: low
cvss: 2.1
cvssVector: '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'
cwe:
  - CWE-116
vendor: swoosh
product: swoosh
affected:
  - swoosh >= 1.12.0 < 1.26.3
  - >-
    swoosh/swoosh >= 23bfcdab71aee4613858ba6d116bb3311b72aa58 <
    e38235453e81d1727bfc8d91e69ec4cb211ccf61
published: '2026-07-06'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T22:17:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54893'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-54893.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/swoosh/swoosh/commit/23bfcdab71aee4613858ba6d116bb3311b72aa58
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/swoosh/swoosh/commit/e38235453e81d1727bfc8d91e69ec4cb211ccf61
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/swoosh/swoosh/security/advisories/GHSA-754j-98wh-57rf'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-54893'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
  - cve.org
epss: 0.00203
epssPercentile: 0.09073
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-06T15:36:04.140981Z'
cvssSource: cna
ingestedAt: '2026-09-24T21:52:59.783Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.