CVE-2026-45543 json
Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible through a lingering Files share
published 2026-06-01 5 mo ago modified 2026-07-22 3 mo ago also EUVD-2026-33713
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected products
- nextcloud security-advisories
Classification
- Weakness
-
- CWE-552 Files or Directories Accessible to External Parties
References
-
github.com
/nextcloud/forms/pull/3291
issue-tracking, patch
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-q4fw-6jf8-5vhh
mitigation, vendor-advisory
-
hackerone.com
/reports/3617352
permissions-required
Sources
- CVE List CVE-2026-45543
- NVD CVE-2026-45543
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.