CVE-2026-40126 — OutSystems Service Center
As of 2026-08-17, CVE-2026-40126 is a Medium-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in OutSystems Service Center, CVSS v4.0 4.8. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-40126, most recently “CVE-2026-40126: DOM-based XSS in OutSystems Service Center via malicious file upload filenames”.
Last updated: 2026-08-17
What is CVE-2026-40126?
OutSystems Service Center is vulnerable to a DOM-based Cross-Site Scripting (XSS) attack that can be exploited by a low-privileged attacker via the upload of a file with a malicious filename containing JavaScript code. The vulnerability exists in all locations where a file can be attached and prepared for upload to the server. This issue was fixed in OutSystems Service Center version 11.41.2
The record classifies CVE-2026-40126 under weakness class CWE-79. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 47 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 4.8 — Medium (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 2.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-08-17
Is CVE-2026-40126 being exploited?
No public exploitation evidence for CVE-2026-40126 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-17. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.
Affected products and versions
- OutSystems: Service Center
How to fix CVE-2026-40126
No vendor patch reference has been recorded for CVE-2026-40126 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-2026-40126
1 tracked threat in the Threadlinqs corpus references CVE-2026-40126, 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 — MEDIUM · 2026-08-17
Sources
Enriched from CVE.org, NVD, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.
Vendor advisory and patch
Third-party advisory
Issue tracking and product pages
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