CVE-2025-65017Public exploitNetwork attack vector

Private data disclosure via truncated UUID associations

Published Feb 3, 2026 · Updated Feb 3, 2026

Data exposure in Decidim 0.30.0 through 0.30.3 and 0.31.0.rc1 through 0.31.0.rc2 allows remote authenticated users to read another user's export. Decidim::PrivateExport attaches files through ActiveStorage, whose bigint record_id coerces each UUID to a numeric prefix and can associate two exports with the same attachment. A participant account and a colliding generated UUID are required; a successful collision exposes another participant's exported account data without altering it.

CVSS severity8.2
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data exposure in Decidim 0.30.0 through 0.30.3 and 0.31.0.rc1 through 0.31.0.rc2 allows remote authenticated users to read another user's export. Decidim::PrivateExport attaches files through ActiveStorage, whose bigint record_id coerces each UUID to a numeric prefix and can associate two exports with the same attachment. A participant account and a colliding generated UUID are required; a successful collision exposes another participant's exported account data without altering it.

The record

CVE
CVE-2025-65017
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Decidim
Product
Decidim
Classifications
CWE-200, CWE-703
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 0.30.0, < 0.30.4
  2. Affected versionversion=>= 0.31.0.r1, < 0.31.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Decidim · Decidimversion=>= 0.30.0, < 0.30.4; version=>= 0.31.0.r1, < 0.31.0

Published CVSS scores

8.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-703Improper Check or Handling of Exceptional Conditions

Public exploit references

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

Technologies

Your stack

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Your stack

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