What is CVE-2021-35503?

CVE-2021-35503 is a medium-severity vulnerability in Afian Filerun, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-10-05.

How severe is CVE-2021-35503?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Afian Filerun

CVE-2021-35503

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-10-05 · last modified 2026-07-05.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Afian Filerun — versions 2021.03.26

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

af854a3a-2127-422b-91ae-364da2661108 (Product)
syntegris-sec.github.io/filerun-advisory (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-35503?: CVE-2021-35503 is a medium-severity vulnerability in Afian Filerun, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-10-05.
How severe is CVE-2021-35503?: Medium severity. CVSS v3 base score is 6.1 out of 10.