CVE-2024-34064

MEDIUM

Jinja - XSS

Title source: llm

Description

Jinja is an extensible templating engine. The `xmlattr` filter in affected versions of Jinja accepts keys containing non-attribute characters. XML/HTML attributes cannot contain spaces, `/`, `>`, or `=`, as each would then be interpreted as starting a separate attribute. If an application accepts keys (as opposed to only values) as user input, and renders these in pages that other users see as well, an attacker could use this to inject other attributes and perform XSS. The fix for CVE-2024-22195 only addressed spaces but not other characters. Accepting keys as user input is now explicitly considered an unintended use case of the `xmlattr` filter, and code that does so without otherwise validating the input should be flagged as insecure, regardless of Jinja version. Accepting _values_ as user input continues to be safe. This vulnerability is fixed in 3.1.4.

Exploits (7)

nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-v6
nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-v5
nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-baseline
nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-v4
nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-v3
nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-v2
nomisec WORKING POC
by SandBlastx · poc
https://github.com/SandBlastx/flask-vuln-v1

Scores

CVSS v3 5.4
EPSS 0.0084
EPSS Percentile 74.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (4)
fedoraproject/fedora 39
fedoraproject/fedora 40
palletsprojects/jinja < 3.1.4
pypi/Jinja2 0 - 3.1.4PyPI
Published May 06, 2024
Tracked Since Feb 18, 2026