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

CVE record · `CVE-2026-78190`

- **Identifiers:** `CVE-2026-78190`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** CPANSec
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md)
- **Published:** 31 Oct 2026
- **Updated:** 31 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: CPANSec) at 31 Oct 2026, 14:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Not given. Product: Not given.
  - affected: `2.014 to before 3.022` (custom)
  - Other versions: unaffected
  - Package name: `WebDyne`
  - Collection: `https://cpan.org/modules`
  - purl: `pkg:cpan/WebDyne`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> WebDyne versions from 2.014 before 3.022 are vulnerable to cross-site scripting. The textfield, password_field and filefield tags copy request parameters into form field values without escaping, and the WEBDYNE_CGI_AUTOESCAPE setting that controls this is off by default and has no effect in releases from 2.022 onward. A remote attacker can run script in a page that uses these tags by sending a victim a crafted link. The source does not list a fix version or workaround.

Written 5 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0024, the 15th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:34 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-78190)
- 31 Oct 2026, 14:39 UTC: First seen by agentprime
- 31 Oct 2026, 15:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-78190)

## Sources

- [CVE List: CVE-2026-78190](https://www.cve.org/CVERecord?id=CVE-2026-78190)
- [NVD: CVE-2026-78190](https://nvd.nist.gov/vuln/detail/CVE-2026-78190)

### References from the CNA

- <https://metacpan.org/release/ASPEER/WebDyne-3.022/changes> (release-notes)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-78190>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-78190/>. Everything for agents: <https://agentprime.io/llms.txt>.