# CVE-2026-40174: Masa CMS CSRF in user address management allows unauthorized address changes

> An attacker can trick a logged-in administrator into modifying user address records, leading to data corruption and communication redirection.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 May 2026
- **Updated:** 7 May 2026
- **Also known as:** GHSA-572m-p246-4356

## What is CVE-2026-40174?

CVE-2026-40174 is a high-severity vulnerability in MasaCMS, published on 6 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Masa CMS is a content management system forked from Mura CMS. In versions 7.5.2 and earlier, the cUsers.updateAddress function does not properly validate anti-CSRF tokens for user address management operations.

An attacker can induce a logged-in administrator to submit a forged request that adds, modifies, or deletes user address records, including email addresses and phone numbers. This can be used to alter contact information, redirect organizational communications, and corrupt address data in the user directory. This issue has been fixed in versions 7.2.10, 7.3.15, 7.4.10, and 7.5.3. As a workaround, restrict access to the administrative backend, use browser isolation for administrative sessions, or deploy filtering rules to block forged requests to the affected endpoint

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-40174?


## How do I fix CVE-2026-40174?

No fix has been published for CVE-2026-40174 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40174 being exploited?

There is no known exploitation of CVE-2026-40174 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40174 and fix it if it is affected.

What it is: CVE-2026-40174 is a high-severity vulnerability in MasaCMS, published on 6 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-40174 in the wild and no public exploit code.

Affected product: MasaCMS. 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-2026-40174/ (Markdown: https://insights.sbomify.com/CVE-2026-40174/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40174
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40174
- OSV: https://osv.dev/vulnerability/CVE-2026-40174

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40174/
Summaries are generated and may contain mistakes; the official description above is the record.