SSRF in Nextcloud Whiteboard

CVE-2026-87897

A SSRF vulnerability found that enables access to internal Chrome Devtools Protocol APIs that can leak the JWT authentication token for another user. A low privileged attacker could continually exploit this vulnerability to leak the JWT authentication token for another user when they start a recording, which then enables the attacker read/write access to the victim's Whiteboard.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published .

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-87897?
CVE-2026-87897 is a medium-severity vulnerability in Nextcloud Whiteboard, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.6/10. Published 2026-10-27.
How severe is CVE-2026-87897?
Medium severity. CVSS v3 base score is 4.6 out of 10.