CVE-2026-55095Network attack vector

Admin-only comment disclosure via raw field ID

Published Aug 20, 2026 · Updated Aug 20, 2026

Information disclosure in OpenProject 17.5.1 and earlier allows remote authenticated users to read hidden custom-field comments via inplace-edit requests. The inplace-edit dialog resolves a project custom field from a raw custom_field_ attribute and renders its stored comment without applying the normal admin_only visibility check. Exploitation requires a non-admin project member account and exposes only the comment text for admin-only project custom fields, with no reported ability to read field values or modify data.

CVSS severity5.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in OpenProject 17.5.1 and earlier allows remote authenticated users to read hidden custom-field comments via inplace-edit requests. The inplace-edit dialog resolves a project custom field from a raw custom_field_ attribute and renders its stored comment without applying the normal admin_only visibility check. Exploitation requires a non-admin project member account and exposes only the comment text for admin-only project custom fields, with no reported ability to read field values or modify data.

The record

CVE
CVE-2026-55095
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
OpenProject GmbH
Product
OpenProject
Classifications
CWE-862
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=< 17.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenProject GmbH · OpenProjectversion=< 17.6.0

Published CVSS scores

5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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