Indico
CVE-2026-25739
MEDIUM
GHSA-jxc4-54g3-j7vp
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 5.4 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: Required. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to compromise the affected system. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Mar 12, 2026
Cross-site scripting in Indico prior to version 3.3.10 allows authenticated users to inject malicious scripts through material file uploads, potentially compromising other users' sessions or stealing sensitive data. The vulnerability affects Indico deployments using Flask-Multipass authentication and requires both user interaction and authenticated access to exploit. A patch is available, and administrators should upgrade to version 3.3.10 and update webserver configurations to enforce strict Content Security Policy for file downloads.
Earlier versions of this analysis (1)
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to cross-site scripting when uploading certain file types as materials. [CVSS 5.4 MEDIUM]
RemediationAI
A vendor patch is available — apply it immediately. Update to version 3.3.10 or later. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in pypi
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Indico. Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to cross-site scripting when uploading certain file types as materials. Users should upgrade to version 3.3.10 to receive a patch. To apply the fix itself updating is sufficient, but to benefit from the strict Content Security Policy (CSP) Indico now applies by default for file downloads, update the webserver config in case one uses nginx with I
Know when Indico gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to cross-site scripting when uploading certain file types as materials. Users should upgrade to version 3.3.10 to receive a patch. To apply the fix itself updating is sufficient, but to benefit from the strict Content Security Policy (CSP) Indico now applies by default for file downloads, update the webserver config in case one uses nginx with Indico's STATIC_FILE_METHOD set to xaccelredirect. For further directions, consult the GitHub Security advisory or Indico setup documentation. Some workarounds are available. Use the webserver config to apply a strict CSP for material download endpoints, and/or only let trustworthy users create content (including material uploads, which speakers can typically do as well) on Indico.
Executive ViewAI
Organizations using Indico should be aware of moderate risk from CVE-2026-25739, a cross-site scripting vulnerability rated CVSS 5.4. Attackers could inject scripts to steal sessions or perform actions as authenticated users. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)GitHub Advisory
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Startin
Stored cross-site scripting in Indico before 3.3.13 lets authenticated users with content-creation privileges - event ma
Stored cross-site scripting in Indico event management system before 3.3.13 lets authenticated users with content-creati
CERN Indico before 2.3.4 can use an attacker-supplied Host header in a password reset link. Rated high severity (CVSS 7.
Server-side request forgery in Indico (all versions prior to 3.3.13) allows an authenticated event organizer to make the
Missing authentication checks on Indico's event series management API endpoint allows unauthenticated attackers to view
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Rated m
Indico is an open source a general-purpose, web based event management tool. Rated medium severity (CVSS 5.4), this vuln
Indico versions before 3.3.10 allow authenticated event organizers to conduct server-side request forgery attacks by pro
Missing per-session authorization in Indico's legacy session export API (all versions prior to 3.3.13) allows any authen
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Rated m
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Rated m
Exploit-DB