CVE-2026-25738 Indico has Server-Side Request Forgery (SSRF) in multiple places
Attackers can exploit SSRF in Indico to access internal services or cloud metadata, primarily affecting deployments on cloud infrastructure like AWS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25738?
CVE-2026-25738 is a medium-severity server-side request forgery vulnerability in indico, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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 server-side request forgery. Indico makes outgoing requests to user-provides URLs in various places. This is mostly intentional and part of Indico's functionality but is never intended to let users access "special" targets such as localhost or cloud metadata endpoints. Users should upgrade to version 3.3.10 to receive a patch. Those who do not have IPs that expose sensitive data without authentication (typically because they do not host Indico on AWS) are not affected. Only event organizers can access endpoints where SSRF could be used to actually see the data returned by such a request. For those who trust their event organizers, the risk is also very limited. For additional security, both before and after patching, one may also use the common proxy-related environment variables (in particular `http_proxy` and `https_proxy`) to force outgoing requests to go through a proxy that limits requests in whatever way you deem useful/necessary. These environment variables would need to be set both on the indico-uwsgi and indico-celery services.
Which versions are affected by CVE-2026-25738?
3 open source packages ship an affected version, including indico. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
indico PyPI | All versions | 3.3.10 |
indico PyPI | All versions | 3.3.10 |
indico PyPI | All versions | 3.3.10 |
Products include Cern Indico.
How do I fix CVE-2026-25738?
Upgrade indico to 3.3.10 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-25738 being exploited?
There is no known exploitation of CVE-2026-25738 in the wild and no public exploit code.
Other vulnerabilities in indico
- CVE-2026-33046 Indico discloses local files resulting in Remote Code Execution through LaTeX injection
- CVE-2021-30185 Indico Tampering with links (e.g. password reset) in sent emails
- CVE-2026-28352 Indico missing access check in event series management API
- CVE-2026-25739 Indico affected by Cross-Site-Scripting via material uploads
- CVE-2023-37901 Cross-Site-Scripting via confirmation prompts
Sources
Also known as GHSA-f47c-3c5w-v7p4, PYSEC-2026-2181.