FKIE_CVE-2026-31859
Vulnerability from fkie_nvd - Published: 2026-03-11 18:16 - Updated: 2026-06-17 10:34
Severity
Summary
Craft is a content management system (CMS). The fix for CVE-2025-35939 in craftcms/cms introduced a strip_tags() call in src/web/User.php to sanitize return URLs before they are stored in the session. However, strip_tags() only removes HTML tags (angle brackets) -- it does not inspect or filter URL schemes. Payloads like javascript:alert(document.cookie) contain no HTML tags and pass through strip_tags() completely unmodified, enabling reflected XSS when the return URL is rendered in an href attribute. This vulnerability is fixed in 5.9.7 and 4.17.3.
References
| URL | Tags | ||
|---|---|---|---|
| security-advisories@github.com | https://github.com/craftcms/cms/security/advisories/GHSA-fvwq-45qv-xvhv | Patch, Vendor Advisory |
{
"affected": [
{
"affectedData": [
{
"product": "cms",
"vendor": "craftcms",
"versions": [
{
"status": "affected",
"version": "\u003e= 4.15.3, \u003c 4.17.3"
},
{
"status": "affected",
"version": "\u003e= 5.7.5, \u003c 5.9.7"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"configurations": [
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"nodes": [
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"criteria": "cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4634EACF-27D5-4F3E-8314-9E02BB40E83F",
"versionEndExcluding": "4.17.3",
"versionStartIncluding": "4.15.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "5.9.7",
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}
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Craft is a content management system (CMS). The fix for CVE-2025-35939 in craftcms/cms introduced a strip_tags() call in src/web/User.php to sanitize return URLs before they are stored in the session. However, strip_tags() only removes HTML tags (angle brackets) -- it does not inspect or filter URL schemes. Payloads like javascript:alert(document.cookie) contain no HTML tags and pass through strip_tags() completely unmodified, enabling reflected XSS when the return URL is rendered in an href attribute. This vulnerability is fixed in 5.9.7 and 4.17.3."
},
{
"lang": "es",
"value": "Craft es un sistema de gesti\u00f3n de contenidos (CMS). La correcci\u00f3n para CVE-2025-35939 en craftcms/cms introdujo una llamada a strip_tags() en src/web/User.php para depurar las URL de retorno antes de que se almacenen en la sesi\u00f3n. Sin embargo, strip_tags() solo elimina las etiquetas HTML (corchetes angulares); no inspecciona ni filtra los esquemas de URL. Las cargas \u00fatiles como javascript:alert(document.cookie) no contienen etiquetas HTML y pasan por strip_tags() sin sufrir ninguna modificaci\u00f3n, lo que permite un XSS reflejado cuando la URL de retorno se representa en un atributo href. Esta vulnerabilidad se ha corregido en las versiones 5.9.7 y 4.17.3."
}
],
"id": "CVE-2026-31859",
"lastModified": "2026-06-17T10:34:38.860",
"metrics": {
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"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
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"impactScore": 2.7,
"source": "nvd@nist.gov",
"type": "Primary"
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
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"ssvcV203": [
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"options": [
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{
"automatable": "yes"
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{
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],
"role": "CISA Coordinator",
"timestamp": "2026-03-12T14:00:11.429488Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-03-11T18:16:24.710",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
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"Vendor Advisory"
],
"url": "https://github.com/craftcms/cms/security/advisories/GHSA-fvwq-45qv-xvhv"
}
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"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
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"lang": "en",
"value": "CWE-79"
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"value": "CWE-116"
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"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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