CVE-2026-28352Network attack vector

Unauthenticated metadata access and modification via unprotected API

Published Feb 27, 2026 · Updated Feb 27, 2026

Missing authentication in CERN Indico before 3.3.11 allows remote attackers to read or alter event-series metadata through its management API. RHEventSeries inherited from the unprotected RH base class, so GET, POST, PATCH, and DELETE handlers accepted requests without checking a session user or event-management rights. No account or user interaction is required; exposure is limited to series metadata and links, not event contents or user-visible event data.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in CERN Indico before 3.3.11 allows remote attackers to read or alter event-series metadata through its management API. RHEventSeries inherited from the unprotected RH base class, so GET, POST, PATCH, and DELETE handlers accepted requests without checking a session user or event-management rights. No account or user interaction is required; exposure is limited to series metadata and links, not event contents or user-visible event data.

The record

CVE
CVE-2026-28352
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
CERN
Product
Indico
Classifications
CWE-306, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.3.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CERN · Indicoversion=< 3.3.11

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1565.002Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo