PT-2026-45531 · Nextcloud · Nextcloud

Dorrajaouad · CVE-2026-45543 · Published 2026-06-01 · Updated 2026-07-22

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud versions 4.3.0 through 5.2.6

Description A removed collaborator retains unauthorized read access to uploaded respondent files for an affected form. This access is limited to uploaded files for forms where the user previously possessed results access.

Recommendations Update to version 5.2.7.

Exploit

Fix

Files Accessible to External Parties

Weakness Enumeration

CWE-552

Related Identifiers

CVE-2026-45543

GHSA-Q4FW-6JF8-5VHH

Affected Products

Nextcloud

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45543.json · Exploit
• https://github.com/nextcloud/forms/pull/3291 · Patch
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-q4fw-6jf8-5vhh · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45543 · Security Note
• https://osv.dev/vulnerability/CVE-2026-45543 · Vendor Advisory
• https://t.me/cveNotify/211619 · Telegram Post
• https://t.me/cveNotify/166034 · Telegram Post
• https://hackerone.com/reports/3617352 · Note