CVE-2026-66353 (GCVE-0-2026-66353)
Vulnerability from cvelistv5 – Published: 2026-08-27 16:44 – Updated: 2026-08-28 14:13
VLAI
EPSS
VEX
Title
Doggo vulnerable to cross-site scripting via unescaped date field values
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 14:01 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/woylie/doggo/security/advisori… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-66353.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-66353 | related |
| https://github.com/woylie/doggo/commit/0161c976a1… | patch |
Impacted products
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"vulnrichment": {
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The text branch delegates to Phoenix.HTML.Form.normalize_value/2, which returns a bare string that HEEx then escapes.\\n\\nAlternatively, pass an explicit value already validated as an ISO 8601 date rather than letting the component read it from the form field, so the value reaching the unescaped branch contains no metacharacters.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eEither of these closes the hole without upgrading.\u003c/p\u003e\\n\u003cp\u003eUse \u003ccode\u003etype=\\\"text\\\"\u003c/code\u003e instead of \u003ccode\u003etype=\\\"date\\\"\u003c/code\u003e for fields whose value can come from user-submitted params. The text branch delegates to \u003ccode\u003ePhoenix.HTML.Form.normalize_value/2\u003c/code\u003e, which returns a bare string that HEEx then escapes.\u003c/p\u003e\\n\u003cp\u003eAlternatively, pass an explicit \u003ccode\u003evalue\u003c/code\u003e already validated as an ISO 8601 date rather than letting the component read it from the form field, so the value reaching the unescaped branch contains no metacharacters.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Either of these closes the hole without upgrading.\\n\\nUse `type=\\\"text\\\"` instead of `type=\\\"date\\\"` for fields whose value can come from user-submitted params. The text branch delegates to `Phoenix.HTML.Form.normalize_value/2`, which returns a bare string that HEEx then escapes.\\n\\nAlternatively, pass an explicit `value` already validated as an ISO 8601 date rather than letting the component read it from the form field, so the value reaching the unescaped branch contains no metacharacters.\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in woylie doggo allows Reflected XSS.\\n\\nDoggo.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 \u003cinput\u003e rendered by the field component unchanged. Any application rendering \u003c.field type=\\\"date\\\"\u003e 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.\\n\\nThis issue affects doggo: from 0.1.0 before 0.14.8.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in woylie doggo allows Reflected XSS.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003eDoggo.normalize_value/2\u003c/code\u003e in \u003ccode\u003elib/doggo.ex\u003c/code\u003e returned \u003ccode\u003edate\u003c/code\u003e field values wrapped in \u003ccode\u003e{:safe, ...}\u003c/code\u003e, the \u003ccode\u003ePhoenix.HTML\u003c/code\u003e marker meaning \\\"already escaped, emit verbatim\\\", without escaping them, so the value reached the \u003ccode\u003evalue\u003c/code\u003e attribute of the \u003ccode\u003e\u0026lt;input\u0026gt;\u003c/code\u003e rendered by the \u003ccode\u003efield\u003c/code\u003e component unchanged. Any application rendering \u003ccode\u003e\u0026lt;.field type=\\\"date\\\"\u0026gt;\u003c/code\u003e 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 \u003ccode\u003etype=\\\"date\\\"\u003c/code\u003e is affected.\u003c/p\u003e\\n\u003cp\u003eThis issue affects doggo: from 0.1.0 before 0.14.8.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in woylie doggo allows Reflected XSS.\\n\\n`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 `\u003cinput\u003e` rendered by the `field` component unchanged. Any application rendering `\u003c.field type=\\\"date\\\"\u003e` 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.\\n\\nThis issue affects doggo: from 0.1.0 before 0.14.8.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:woylie:doggo:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.14.8\", \"versionStartIncluding\": \"0.1.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-27T16:44:59.553Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-66353\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-28T14:13:54.861Z\", \"dateReserved\": \"2026-08-25T10:30:01.736Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-27T16:44:59.553Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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