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Indico: Cross-Site-Scripting in link fields

Moderate severity GitHub Reviewed Published Aug 25, 2026 in indico/indico • Updated Oct 8, 2026

Package

pip indico (pip)

Affected versions

< 3.3.13

Patched versions

3.3.13

Description

Impact

There is a Cross-Site-Scripting vulnerability in fields that allow entering custom URLs.

Patches

You should to update to Indico 3.3.13 as soon as possible.
See the docs for instructions on how to update.

Workarounds

  • Set CSP_ENABLED = True in indico.conf - this is recommended regardless of updating.
  • Only let trustworthy users manage events or create content (including material uploads which speakers can typically do as well) on Indico.

For more information

If you have any questions or comments about this advisory:

References

@ThiefMaster ThiefMaster published to indico/indico Aug 25, 2026
Published by the National Vulnerability Database Oct 8, 2026
Published to the GitHub Advisory Database Oct 8, 2026
Reviewed Oct 8, 2026
Last updated Oct 8, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(9th percentile)

Weaknesses

Incomplete Denylist to Cross-Site Scripting

The product uses a denylist-based protection mechanism to defend against XSS attacks, but the denylist is incomplete, allowing XSS variants to succeed. Learn more on MITRE.

CVE ID

CVE-2026-107396

GHSA ID

GHSA-c4wc-ggrj-jg9v

Source code

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