CVE-2026-75135
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.001 (0.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Weakness classification (CWE)
References
- upsignon.eu/en/resources/release-notes/app (release-notes)
- www.vulncheck.com/advisories/upsignon-sensitive-key-retention-in-memory (third-party-advisory)
Frequently asked questions
- What is CVE-2026-75135?
- CVE-2026-75135 is a medium-severity vulnerability, classified under CWE-316. CVSS score: 6.1/10. Published 2026-09-02.
- How severe is CVE-2026-75135?
- Medium severity. CVSS v3 base score is 6.1 out of 10.