CVE-2026-27723Network attack vector

Cross-project wiki creation via missing authorization

Published Mar 5, 2026 · Updated Mar 5, 2026

Improper access control in OpenProject before 17.0.5 and 17.1.2 allows remote authenticated users to create wiki pages in unauthorized projects. The wiki-page creation request accepts a target project without enforcing the caller's wiki-creation permission; no endpoint or function is published. A low-privileged account and network access are sufficient; the demonstrated consequence is unauthorized stored-content creation, not data disclosure or service interruption.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in OpenProject before 17.0.5 and 17.1.2 allows remote authenticated users to create wiki pages in unauthorized projects. The wiki-page creation request accepts a target project without enforcing the caller's wiki-creation permission; no endpoint or function is published. A low-privileged account and network access are sufficient; the demonstrated consequence is unauthorized stored-content creation, not data disclosure or service interruption.

The record

CVE
CVE-2026-27723
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
OpenProject GmbH
Product
OpenProject
Classifications
CWE-284, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=< 17.0.5
  2. Affected versionversion=< 17.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenProject GmbH · OpenProjectversion=< 17.0.5; version=< 17.1.2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1565.001Data Manipulation: Stored Data Manipulation

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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