# CVE-2026-75135 — Septeo IT Solutions UpSignOn

> As of 2026-09-02, CVE-2026-75135 is a MEDIUM-severity vulnerability in Septeo IT Solutions UpSignOn, CVSS v3.1 6.1, EPSS 0.0% (5.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-75135 as of 2026-09-02; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-02

## What is CVE-2026-75135?

UpSignOn for Windows before 7.19.0 contains a sensitive data exposure vulnerability that allows local attackers to recover the master password and decrypt vault contents by reading a retained backup key from the process memory of UpSignOn.exe, even after the vault has been re-locked. Attackers can extract the backup key from process memory to decrypt the encrypted master password backup stored in v6-vault1.DATA.txt, then use the recovered master password to decrypt the main vault and export all password manager entries in cleartext.

The record classifies CVE-2026-75135 under weakness class [CWE-316](https://cwe.mitre.org/data/definitions/316.html). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 33 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.1 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **CVSS v4.0 base score:** 6.9 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.0% probability of exploitation in the next 30 days, higher than 5.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-02

## Is CVE-2026-75135 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Septeo IT Solutions**: UpSignOn

## How to fix CVE-2026-75135

No vendor patch reference has been recorded for CVE-2026-75135 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-2026-75135

No threat campaign in the Threadlinqs corpus currently references CVE-2026-75135, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-09-04. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [upsignon.eu — release notes](https://upsignon.eu/en/resources/release-notes/app#7.19.0)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/upsignon-sensitive-key-retention-in-memory)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-75135
Full detection coverage and IOCs for threats exploiting CVE-2026-75135 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp