Deluge Web-UI vulnerable to XSS through a crafted torrent file

published 2022-08-26 4 y ago modified 2026-06-17 4 mo ago also GHSA-5c8p-qhch-qhx6 , PYSEC-2022-256 , EUVD-2022-0075

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

The Deluge Web-UI is vulnerable to XSS through a crafted torrent file. The the data from torrent files is not properly sanitised as it's interpreted directly as HTML. Someone who supplies the user with a malicious torrent file can execute arbitrary Javascript code in the context of the user's browser session.

Patch / fix

fixed in 2 distros 2 links 1

pypi deluge 2.1.0
deluge-torrent deluge 2.1.0

debian opensuse

deluge Debian 14, Debian 13 2.1.1-4

debian advisories DEBIAN-CVE-2021-3427

deluge openSUSE Tumbleweed 2.1.1-3.1

opensuse advisories openSUSE-SU-2024:12322-1

dev.deluge-torrent.org/ticket/3459 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3427 updated 2026-03-27 cvss 6.1

deluge: XSS in webui via crafted torrent file

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

dev.deluge-torrent.org https://dev.deluge-torrent.org/ticket/3459 referenced PoC, tagged "exploit" by a source, unverified
groups.google.com https://groups.google.com/g/deluge-dev/c/e5zh7wT0rEg referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	deluge	<2.1.0	2.1.0

Affected products

n/a Deluge-web

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

dev.deluge-torrent.org /ticket/3459
web, exploit, issue-tracking, patch, vendor-advisory
groups.google.com /g/deluge-dev/c/e5zh7wT0rEg
web, exploit, issue-tracking, mailing-list, third-party-advisory
security.gentoo.org /glsa/202210-07
vendor-advisory, web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-3427
advisory
github.com /advisories/GHSA-5c8p-qhch-qhx6
advisory
github.com /deluge-torrent/deluge
package
github.com /pypa/advisory-database/tree/main/vulns/deluge/PYSEC-2022-256.yaml
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary