🛡️ CVE-2026-45543 — forms

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-552 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Nextcloud is an open source content collaboration platform. From version 4.3.0 to before version 5.2.7, a removed collaborator retains unauthorized read access to uploaded respondent files for the affected form. The scope is limited to uploaded files for forms where that user previously had results access. This issue has been patched in version 5.2.7.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-45543 is classified as CWE-552: Files or Directories Accessible to External Parties. Files intended to stay internal are reachable from outside the application.

Affected software

CVE-2026-45543 is recorded against 2 packages.

  • forms (from 4.3.0 up to 5.2.7)
  • unknown

Timeline and source

Published on 1 June 2026 and last revised on 22 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
hackerone.com

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-552
Public Exploit ✅ No
Source NVD
Published 2026-06-01
Updated 2026-08-11
Modified 2026-07-22

Affected Packages

Software From version Fixed in
forms 4.3.0 5.2.7
unknown — —

Similar Threats

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