CVE-2023-34090Public exploitNetwork attack vector

Unauthenticated data disclosure via unrestricted meeting filters

Published Jul 11, 2023 · Updated Oct 23, 2024

Information disclosure in Decidim 0.27.0 through 0.27.2 allows remote attackers to infer non-public database values through meeting filters. CalendarsController passes the user-controlled filter parameter through CalendarRenderer to ComponentCalendar, where Ransack evaluates unrestricted attributes and associations as a response oracle. The meetings component must be enabled and contain at least one meeting; repeated starts-with predicates disclose values such as participant email addresses character by character.

CVSS severity7.5
High
EPSS probability1.25%
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

Information disclosure in Decidim 0.27.0 through 0.27.2 allows remote attackers to infer non-public database values through meeting filters. CalendarsController passes the user-controlled filter parameter through CalendarRenderer to ComponentCalendar, where Ransack evaluates unrestricted attributes and associations as a response oracle. The meetings component must be enabled and contain at least one meeting; repeated starts-with predicates disclose values such as participant email addresses character by character.

The record

CVE
CVE-2023-34090
Published
Jul 11, 2023
Updated
Oct 23, 2024
Vendor
Decidim
Product
Decidim
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 2024Record 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=>= 0.27.0, < 0.27.3
  2. Affected versionversion=0.27.0 <0.27.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Decidim · Decidimversion=>= 0.27.0, < 0.27.3; version=0.27.0 <0.27.3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

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