What is CVE-2026-82043?

CVE-2026-82043 is a medium-severity vulnerability in Utmstack, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-10-02.

How severe is CVE-2026-82043?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Utmstack

CVE-2026-82043

UTMStack before 11.2.16 contains an account enumeration vulnerability that allows unauthenticated attackers to determine registered email addresses by observing differing HTTP responses from the POST /api/account/reset-password/init endpoint. Attackers can submit arbitrary email addresses and distinguish registered accounts, which return 200 OK, from unregistered accounts, which trigger a 500 Internal Server Error with backend error details, enabling targeted phishing or credential attacks.

Published 2026-10-02.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Utmstack

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

github.com/UTMStack/UTMStack/releases/tag/v11.2.16 (release-notes)
github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd (patch)
www.vulncheck.com/advisories/utmstack-account-enumeration-via-password-reset-en… (third-party-advisory)

Frequently asked questions

What is CVE-2026-82043?: CVE-2026-82043 is a medium-severity vulnerability in Utmstack, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-10-02.
How severe is CVE-2026-82043?: Medium severity. CVSS v3 base score is 5.3 out of 10.