CVE-2026-28352: Indico Indico Has A Missing Access Vulnerability

MODERATE
Advisory Identifier: GHSA-rfpp-2hgm-gp5v
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CVSS 6.5
CWE-306
Published
Advisory Summary

CVE-2026-28352 is a MODERATE (CVSS 6.5) indico has a missing access vulnerability (CWE-306: Missing Authentication for Critical Function) affecting Indico libraries in the PyPI ecosystem. The issue involves indico has a missing access check in the event series management api. Remediation is available by upgrading affected packages to version 3.3.11.

CVE-2026-28352 at a Glance

CVE Identifier CVE-2026-28352
GHSA Identifier GHSA-rfpp-2hgm-gp5v
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-306: Missing Authentication for Critical Function
Affected Product Indico
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-28352

To remediate this vulnerability, upgrade all affected Indico dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

indico fixed: 3.3.11 
pip install indico>=3.3.11
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show indico

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-28352, inspect your installed packages using pip:

pip show indico

Analyze the terminal output to locate any version of Indico in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.11), your application is affected.

Note: The pip show indico command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-306: Missing Authentication for Critical Function, where the product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. In Indico, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact The API endpoint used to manage event series is missing an access check, allowing unauthenticated/unauthorized access to this endpoint. The impact of this is limited to: - Getting the metadata (title, category chain, start/end date) for events in an existing series - Deleting an existing event series: This just removes the series metadata, ie (if enabled) the links between events in the same series and the lecture series number in the event title - Modifying an existing event series: Just like for deleting, it would only allow to toggle the metadata display. It could also be used to set an event title pattern for the series, but this is only used when cloning an event from that series. That this vulnerability does NOT allow unauthorized access to events (beyond the basic metadata mentioned above), nor any kind of tampering with user-visible data in events. ### Patches Developers should to update to [Indico 3.3.11](https://github.com/indico/indico/releases/tag/v3.3.11) as soon as possible. See [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update. ### Workarounds - Developers can configure their webserver to restrict access to the series management API endpoint ### For more information If there are any questions or comments about this advisory: - Open a thread in [our forum](https://talk.getindico.io/) - Email Indico privately at [indico-team@cern.ch](mailto:indico-team@cern.ch)

CVE-2026-28352 Affected Indico Versions

1 component(s)
Fixed Versions:
3.3.11
Product / Package Ecosystem Affected Versions Fixed Version
indico
pypi/indico
PyPI
< 3.3.11
3.3.11

References

GitHub Advisory / Wiki ADVISORY
https://github.com/indico/indico/security/advisories/GHSA-rfpp-2hgm-gp5v
NVD — CVE-2026-28352 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28352
Indico Source Repository REPOSITORY
https://github.com/indico/indico
Indico Release RELEASE
https://github.com/indico/indico/releases/tag/v3.3.11

Frequently Asked Questions

What is CVE-2026-28352?
CVE-2026-28352 is a security vulnerability in Indico involving Indico has a missing access check in the event series management API under CWE-306: Missing Authentication for Critical Function.
Which Indico versions are affected?
Affected versions include releases prior to 3.3.11 across affected packages: indico.
What version fixes CVE-2026-28352?
Upgrading to 3.3.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is indico affected?
Yes, indico is affected in releases prior to 3.3.11. Upgrade your dependency to 3.3.11 or later.
What is the CVSS score of CVE-2026-28352?
CVE-2026-28352 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-28352?
CVE-2026-28352 is classified under CWE-306: Missing Authentication for Critical Function (The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.).
How can I check PyPI dependencies for CVE-2026-28352?
Run the dependency tree command: 'pip show indico'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rfpp-2hgm-gp5v",
  "modified" : "2026-03-01T01:24:27Z",
  "published" : "2026-03-01T01:24:27Z",
  "aliases" : [ "CVE-2026-28352" ],
  "summary" : "Indico has a missing access check in the event series management API",
  "details" : "### Impact\nThe API endpoint used to manage event series is missing an access check, allowing unauthenticated/unauthorized access to this endpoint.\n\nThe impact of this is limited to:\n\n- Getting the metadata (title, category chain, start/end date) for events in an existing series\n- Deleting an existing event series: This just removes the series metadata, ie (if enabled) the links between events in the same series and the lecture series number in the event title\n- Modifying an existing event series: Just like for deleting, it would only allow to toggle the metadata display. It could also be used to set an event title pattern for the series, but this is only used when cloning an event from that series.\n\nThat this vulnerability does NOT allow unauthorized access to events (beyond the basic metadata mentioned above), nor any kind of tampering with user-visible data in events.\n\n### Patches\nDevelopers should to update to [Indico 3.3.11](https://github.com/indico/indico/releases/tag/v3.3.11) as soon as possible.\nSee [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update.\n\n### Workarounds\n- Developers can configure their webserver to restrict access to the series management API endpoint\n\n### For more information\nIf there are any questions or comments about this advisory:\n\n- Open a thread in [our forum](https://talk.getindico.io/)\n- Email Indico privately at [indico-team@cern.ch](mailto:indico-team@cern.ch)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "indico"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/security/advisories/GHSA-rfpp-2hgm-gp5v"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-28352"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/indico/indico"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/releases/tag/v3.3.11"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-01T01:24:27Z",
    "nvd_published_at" : "2026-02-27T21:16:19Z"
  }
}