---
id: "CVE-2026-91399"
kind: "vulnerability"
aliases: ["CVE-2026-91399"]
title: "Oracle Primavera P6 Web Access: low-privileged users can alter some project data"
severity: "medium"
cvss: 4.3
epss: 0.00193
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["oracle", "primavera-p6", "self-hosted", "vendor", "web-access"]
not_affected_if: ["unaffected-version"]
published_at: "2026-10-20T22:20:43+00:00"
first_seen_at: "2026-10-23T21:57:26+00:00"
updated_at: "2026-10-25T12:38:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91399", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91399", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Primavera P6 Web Access: low-privileged users can alter some project data

Oracle Primavera P6 Enterprise Project Portfolio Management's Web Access component has a flaw that lets a low-privileged user with network access over HTTP make unauthorized updates, inserts or deletes to some data. The CVSS 3.1 score is 4.3 with integrity impact only.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Primavera P6 version against the affected ranges: 21.12.0.0-21.12.21.9, 22.12.0.0-22.12.21.4, 23.12.0-23.12.20, 24.12.0-24.12.16 and 25.12.0-25.12.8.

## Fix

- Move Primavera P6 to the patched release Oracle lists for your version line; the sources do not name the fixed build numbers.

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91399
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91399

## From the sources

Vulnerability in the Primavera P6 Enterprise Project Portfolio Management product of Oracle Construction and Engineering (component: Web Access).  Supported versions that are affected are 21.12.0.0-21.12.21.9, 22.12.0.0-22.12.21.4, 23.12.0-23.12.20, 24.12.0-24.12.16 and 25.12.0-25.12.8. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Primavera P6 Enterprise Project Portfolio Management.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Primavera P6 Enterprise Project Portfolio Management accessible data. CVSS 3.1 Base Score 4.3 (Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_