# CVE-2026-45275: Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with approvers

> Attackers can bypass sharing restrictions to force file distribution to approvers, leading to unauthorized data access and privilege escalation.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jun 2026
- **Updated:** 1 Jun 2026
- **Also known as:** GHSA-v8q8-w6c3-3gv9

## What is CVE-2026-45275?

CVE-2026-45275 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Nextcloud is an open source content collaboration platform. Prior to version 2.7.2, a privilege escalation vulnerability exists in the Approval app that allows a user without sharing permissions to force the system to share a file with approvers. This results in an authorization bypass and privilege escalation, allowing unauthorized distribution of restricted files. This issue has been patched in version 2.7.2.

Weakness: CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-45275?

It affects 1 product.


Products: Nextcloud Approval.

## How do I fix CVE-2026-45275?

No fix has been published for CVE-2026-45275 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-45275 being exploited?

There is no known exploitation of CVE-2026-45275 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2026-45277](https://insights.sbomify.com/CVE-2026-45277/): Nextcloud: Information disclosure in Nextcloud Approval app via fileId parameter reveals workflow associations (low 3.3)
- [CVE-2025-66515](https://insights.sbomify.com/CVE-2025-66515/): Nextcloud Approval app allows users to request approval for other users file (low 2.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45275 and fix it if it is affected.

What it is: CVE-2026-45275 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-45275 in the wild and no public exploit code.

Affected product: nextcloud security-advisories. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45275/ (Markdown: https://insights.sbomify.com/CVE-2026-45275/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45275
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45275
- OSV: https://osv.dev/vulnerability/CVE-2026-45275

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45275/
Summaries are generated and may contain mistakes; the official description above is the record.