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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Nextcloud |
|
No data.
No data.
References
| Link | Providers |
|---|---|
| https://hackerone.com/reports/3576823 |
|
History
Wed, 04 Nov 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 28 Oct 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Nextcloud
Nextcloud whiteboard |
|
| Vendors & Products |
Nextcloud
Nextcloud whiteboard |
Tue, 27 Oct 2026 18:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | SSR Leakage of JWT Tokens in Nextcloud Whiteboard via DevTools Protocol |
Tue, 27 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Weaknesses | CWE-918 | |
| References |
| |
| Metrics |
cvssV3_0
|
MITRE
Status: PUBLISHED
Assigner: hackerone
Published: 2026-10-27T16:15:34.742Z
Updated: 2026-11-04T17:59:02.350Z
Reserved: 2026-09-09T15:00:00.573Z
Link: CVE-2026-87897
Vulnrichment
Updated: 2026-11-04T17:58:58.344Z
NVD
Status : Awaiting Analysis
Published: 2026-10-27T17:17:03.530
Modified: 2026-11-04T18:17:46.150
Link: CVE-2026-87897
Redhat
No data.