# CVE-2026-73632: Apache Struts: Shared serialization state in the JSON plugin

> Concurrent requests may share serialization state, exposing response data from one session to another in Apache Struts JSON-RPC configurations.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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:** 15 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** GHSA-87hf-473v-8h9c

## What is CVE-2026-73632?

CVE-2026-73632 is a medium-severity vulnerability in Apache Struts, published on 15 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Exposure of data element to wrong session vulnerability in the JSON plugin of Apache Struts. Per-response serialization state could be shared across concurrent requests, allowing response content associated with one request to become observable in another. Only the SMD / JSON-RPC handling of the JSON interceptor is affected, which is not enabled by default; applications using the json result type are not affected.

This issue affects Apache Struts: 7.2.1.

Users are recommended to upgrade to version 7.3.0, which fixes the issue.

Weakness: CWE-567 (Unsynchronized Access to Shared Data in a Multithreaded Context)

## Which versions are affected by CVE-2026-73632?

It affects 1 product.


Products: Apache Struts.

## How do I fix CVE-2026-73632?

No fix has been published for CVE-2026-73632 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73632 being exploited?

There is no known exploitation of CVE-2026-73632 in the wild and no public exploit code.

## Other vulnerabilities in Apache Struts

- [CVE-2020-17530](https://insights.sbomify.com/CVE-2020-17530/): Apache Struts Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-9791](https://insights.sbomify.com/CVE-2017-9791/): Apache Struts 1 Improper Input Validation (critical 9.8, exploited in the wild)
- [CVE-2017-5638](https://insights.sbomify.com/CVE-2017-5638/): Apache Struts Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2012-0391](https://insights.sbomify.com/CVE-2012-0391/): Apache Struts 2 Improper Input Validation (critical 9.8, exploited in the wild)
- [CVE-2018-11776](https://insights.sbomify.com/CVE-2018-11776/): Apache Struts Remote Code Execution (high 8.1, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73632 and fix it if it is affected.

What it is: CVE-2026-73632 is a medium-severity vulnerability in Apache Struts, published on 15 Aug 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-2026-73632 in the wild and no public exploit code.

Affected product: Apache Struts. 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-2026-73632/ (Markdown: https://insights.sbomify.com/CVE-2026-73632/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73632
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73632
- OSV: https://osv.dev/vulnerability/CVE-2026-73632

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73632/
Summaries are generated and may contain mistakes; the official description above is the record.