What is CVE-2026-87099?

CVE-2026-87099 is a medium-severity vulnerability in Acronis Cyber Protect 17, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2026-10-28.

How severe is CVE-2026-87099?

Medium severity. CVSS v3 base score is 5.7 out of 10.

XSS in Acronis Cyber Protect 17

CVE-2026-87099

Cross-site scripting (XSS) vulnerability due to improper input validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/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

Acronis Cyber Protect 17

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisory.acronis.com/advisories/SEC-8835 (vendor-advisory)

Frequently asked questions

What is CVE-2026-87099?: CVE-2026-87099 is a medium-severity vulnerability in Acronis Cyber Protect 17, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2026-10-28.
How severe is CVE-2026-87099?: Medium severity. CVSS v3 base score is 5.7 out of 10.