# CVE-2026-15538: primefaces primereact API ObjectUtils.js ObjectUtils.mutateFieldData prototype pollution

> Remote attackers can exploit prototype pollution in PrimeReact's ObjectUtils to execute arbitrary code or escalate privileges.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **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:** 13 Jul 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-hgqw-899r-rc46, GHSA-vg36-rrrg-4wqv

## What is CVE-2026-15538?

CVE-2026-15538 is a medium-severity code injection vulnerability in primefaces primereact, published on 13 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A weakness has been identified in primefaces primereact up to 10.9.8. This issue affects the function ObjectUtils.mutateFieldData of the file components/lib/utils/ObjectUtils.js of the component API. This manipulation of the argument Field causes improperly controlled modification of object prototype attributes. The attack is possible to be carried out remotely. Upgrading to version 10.9.9 and 11.0.0 is capable of addressing this issue. Patch name: 61f182e11d9ef52032ff56f420da763a6938236f. It is recommended to upgrade the affected component.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes)

## Which versions are affected by CVE-2026-15538?


## How do I fix CVE-2026-15538?

No fix has been published for CVE-2026-15538 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15538 being exploited?

There is no known exploitation of CVE-2026-15538 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15538 and fix it if it is affected.

What it is: CVE-2026-15538 is a medium-severity code injection vulnerability in primefaces primereact, published on 13 Jul 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-2026-15538 in the wild and no public exploit code.

Affected product: primefaces primereact. 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-2026-15538/ (Markdown: https://insights.sbomify.com/CVE-2026-15538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15538
- OSV: https://osv.dev/vulnerability/CVE-2026-15538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15538/
Summaries are generated and may contain mistakes; the official description above is the record.