PT-2026-45477 · Nextcloud · Nextcloud

Alimony · CVE-2026-45267 · Published 2026-06-01 · Updated 2026-06-01

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Nextcloud versions prior to 5.2.6

Description Nextcloud is an open source content collaboration platform. A missing permissions check allows users to request and read form submissions belonging to other users.

Recommendations Update to version 5.2.6.

Exploit

Fix

Missing Authorization

Information Disclosure

Weakness Enumeration

CWE-862

CWE-200

Related Identifiers

CVE-2026-45267

GHSA-R4GH-F8X6-M55F

Affected Products

Nextcloud

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45267.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-45267 · Security Note
• https://osv.dev/vulnerability/CVE-2026-45267 · Vendor Advisory
• https://github.com/nextcloud/forms/pull/3269 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r4gh-f8x6-m55f · Note
• https://hackerone.com/reports/3628817 · Note
• https://t.me/CVEtracker/55513 · Telegram Post