CVE-2026-66353 Doggo vulnerable to cross-site scripting via unescaped date field values
Reflected XSS in Doggo library allows attackers to inject scripts via date fields, potentially leading to code execution in web applications using the library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-66353?
CVE-2026-66353 is a medium-severity cross-site scripting vulnerability in woylie doggo, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in woylie doggo allows Reflected XSS.
Doggo.normalize_value/2 in lib/doggo.ex returned date field values wrapped in {:safe, ...}, the Phoenix.HTML marker meaning "already escaped, emit verbatim", without escaping them, so the value reached the value attribute of the <input> rendered by the field component unchanged. Any application rendering <.field type="date"> over user-controlled params is affected through the ordinary Phoenix form round-trip, where a failed validation re-renders the submitted value. The pattern kept exactly the first ten bytes and discarded shorter values, capping a payload at ten bytes: enough to terminate the attribute and open an element or attach a short event handler, not enough to place attacker-chosen script inline. Only type="date" is affected.
This issue affects doggo: from 0.1.0 before 0.14.8.
Weakness: CWE-79
Which versions are affected by CVE-2026-66353?
1 open source package ship an affected version, including doggo.
| Package | Affected | Fixed in |
|---|---|---|
doggo Hex | From 0.1.0 | 0.14.8 |
How do I fix CVE-2026-66353?
Upgrade doggo to 0.14.8 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-66353 being exploited?
There is no known exploitation of CVE-2026-66353 in the wild and no public exploit code.
Sources
Also known as EEF-CVE-2026-66353, GHSA-w9rp-cf93-86pj.