# CVE-2026-40127 — OutSystems Lifetime

> As of 2026-08-11, CVE-2026-40127 is a Medium-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in OutSystems Lifetime, CVSS v4.0 5.3, EPSS 0.5% (47.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-40127, most recently “CVE-2026-40126: DOM-based XSS in OutSystems Service Center via malicious file upload filenames”.

**Last updated:** 2026-08-11

## What is CVE-2026-40127?

OutSystems Lifetime is vulnerable to Authorization Bypass Through User-Controlled Key vulnerability in ApplicationID parameter. Any authenticated user, can read the Change Log containing actions performed by other users as well as application name of any application. This issue was fixed in OutSystems Lifetime version 11.28.2.3955

The record classifies CVE-2026-40127 under weakness class [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 153 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 5.3 — Medium (derived from score) (`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`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 47.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-05-25, last modified 2026-08-11

## Is CVE-2026-40127 being exploited?

It currently carries a trending score of 17 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **OutSystems**: Lifetime

## How to fix CVE-2026-40127

No vendor patch reference has been recorded for CVE-2026-40127 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-40127

1 tracked threat in the Threadlinqs corpus references CVE-2026-40127, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-40126: DOM-based XSS in OutSystems Service Center via malicious file upload filenames](https://intel.threadlinqs.com/threat/TL-2026-2043) — MEDIUM · 2026-08-17

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [success.outsystems.com — vendor advisory](https://success.outsystems.com/support/security/vulnerabilities/vulnerability_rpm_6441/)

**Third-party advisory**

- [cert.pl — third party advisory](https://cert.pl/en/posts/2026/05/CVE-2026-40126/)

**Issue tracking and product pages**

- [outsystems.com — product](https://www.outsystems.com/downloads/ScreenDetails?ReleaseId=22953&MajorVersion=11&ComponentName=LifeTime)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-40127
Full detection coverage and IOCs for threats exploiting CVE-2026-40127 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp