---
id: CVE-2021-35503
title: >-
  Afian FileRun 2021.03.26 allows stored XSS via an HTTP X-Forwarded-For header
  that is mishandled when rendering Activity Logs.
summary: >-
  Afian FileRun 2021.03.26 allows stored XSS via an HTTP X-Forwarded-For header
  that is mishandled when rendering Activity Logs.
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: afian
product: filerun
affected:
  - filerun = 2021.03.26
published: '2021-10-05'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-35503'
references:
  - url: 'https://syntegris-sec.github.io/filerun-advisory'
    label: cve@mitre.org
  - url: 'http://blog.filerun.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://syntegris-sec.github.io/filerun-advisory'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00742
epssPercentile: 0.52649
ingestedAt: '2026-07-06T17:03:23.583Z'
---

## Overview

Afian FileRun 2021.03.26 allows stored XSS via an HTTP X-Forwarded-For header that is mishandled when rendering Activity Logs.

## Affected

- `filerun = 2021.03.26`

## Remediation

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