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.
Published: 2026-10-27
Score: 4.6 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
Link Providers
https://hackerone.com/reports/3576823 cve-icon cve-icon
History

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

{'score': 4.6, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-10-27T16:15:34.742Z

Reserved: 2026-09-09T15:00:00.573Z

Link: CVE-2026-87897

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-27T17:17:03.530

Modified: 2026-10-27T17:17:03.530

Link: CVE-2026-87897

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T18:15:06Z

Weaknesses