---
title: "CVE-2026-96757: Orval - Stored XSS"
description: "Orval < 8.29.0 contains a stored XSS caused by failure to escape OpenAPI media-type keys in single-quoted Content-Type string literals, letting attackers inject JavaScript executed in generated fetch operations or mock resolvers, exploit requires crafted OpenAPI specifications."
url: https://panop.io/threat-heartbeat/CVE-2026-96757/
---

# CVE-2026-96757 Orval - Stored XSS

Orval < 8.29.0 contains a stored XSS caused by failure to escape OpenAPI media-type keys in single-quoted Content-Type string literals, letting attackers inject JavaScript executed in generated fetch operations or mock resolvers, exploit requires crafted OpenAPI specifications.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.57% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-96757)

## Details

Type

Stored XSS

Impact

Client Script Exec

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Update to version 8.29.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-96757](https://nvd.nist.gov/vuln/detail/CVE-2026-96757)
- [https://github.com/orval-labs/orval](https://github.com/orval-labs/orval)
- [https://github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts#L584](https://github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts#L584)
- [https://github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb768f6a718adb](https://github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb768f6a718adb)
- [https://github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5](https://github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5)
- [https://github.com/orval-labs/orval/pull/4007](https://github.com/orval-labs/orval/pull/4007)
- [https://github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-3x8p](https://github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-3x8p)
- [https://github.com/orval-labs/orval/security/advisories/GHSA-rcpr-mq4m-jx9j](https://github.com/orval-labs/orval/security/advisories/GHSA-rcpr-mq4m-jx9j)
- [https://www.vulncheck.com/advisories/orval-before-8.29.0-code-injection-via-unescaped-openapi-media-type](https://www.vulncheck.com/advisories/orval-before-8.29.0-code-injection-via-unescaped-openapi-media-type)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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