# CVE-2026-92589: Craft CMS 5.0.0 before 5.10.13 Broken Access Control via nested-elements/reorder

> Authenticated view-only users can modify Matrix block sort order in Craft CMS due to missing save permission checks on the reorder endpoint.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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:** 16 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-6fp2-8j9w-7mj8, GHSA-mhr8-6rjx-8fjw

## What is CVE-2026-92589?

CVE-2026-92589 is a medium-severity missing authorization vulnerability in craftcms cms, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Craft CMS 5.0.0 through 5.10.12 (fixed in 5.10.13) contains a broken access control flaw in the nested-elements reorder endpoint. When an authenticated control panel user with viewEntries and viewPeerEntries (but without savePeerEntries) opens another author's entry in read-only mode, Craft unconditionally grants that session a `manageNestedElements::<ownerId>::field:<handle>` authorization flag for the entry's Matrix/Address fields. Unlike the corresponding delete endpoint, actions/nested-elements/reorder trusts this session flag alone and never rechecks the caller's save permission for the owner element. As a result, a view-only user can POST to actions/nested-elements/reorder using the ownerElementType, ownerId, ownerSiteId, attribute, elementIds, and offset parameters present in the read-only page source and rewrite the sort order of Matrix blocks or Addresses belonging to content they are explicitly denied save access to.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-92589?


## How do I fix CVE-2026-92589?

No fix has been published for CVE-2026-92589 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-92589 being exploited?

There is no known exploitation of CVE-2026-92589 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-92589 and fix it if it is affected.

What it is: CVE-2026-92589 is a medium-severity missing authorization vulnerability in craftcms cms, published on 16 Sep 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-2026-92589 in the wild and no public exploit code.

Affected product: craftcms cms. 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-2026-92589/ (Markdown: https://insights.sbomify.com/CVE-2026-92589/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-92589
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-92589
- OSV: https://osv.dev/vulnerability/CVE-2026-92589

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-92589/
Summaries are generated and may contain mistakes; the official description above is the record.