CVE-2026-107397 Indico: Cross-Site-Scripting in minutes editor
Attackers can inject malicious scripts into event minutes, executing code in viewers' browsers during concurrent edits, requiring an upgrade to Indico.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-107397?
CVE-2026-107397 is a medium-severity cross-site scripting vulnerability in indico, published on 8 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to 3.3.13, users who can create content, including speakers who can create minutes, can store crafted HTML in event minutes. When concurrent edits are made to the same minutes, the minute editor conflict UI can execute attacker-controlled script in the viewer's browser in the Indico origin. This issue is fixed in version 3.3.13.
Weakness: CWE-79
Which versions are affected by CVE-2026-107397?
3 open source packages ship an affected version, including indico.
| Package | Affected | Fixed in |
|---|---|---|
indico PyPI | All versions | 3.3.13 |
indico PyPI | All versions | 3.3.13 |
indico PyPI | All versions | 3.3.13 |
How do I fix CVE-2026-107397?
Upgrade indico to 3.3.13 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-107397 being exploited?
There is no known exploitation of CVE-2026-107397 in the wild and no public exploit code.
Sources
Also known as GHSA-cw24-x4mj-fw3q, PYSEC-2026-4228.