CVE-2026-129427

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-129427", "assignerOrgId": "772f0079-75c2-41ca-913e-d9072716578b", "state": "PUBLISHED", "assignerShortName": "Grayback", "dateReserved": "2026-11-14T11:12:40.073Z", "datePublished": "2026-11-14T11:19:54.038Z", "dateUpdated": "2026-11-14T11:19:54.038Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "772f0079-75c2-41ca-913e-d9072716578b", "shortName": "Grayback", "dateUpdated": "2026-11-14T11:19:54.038Z"}, "title": "Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-79", "description": "CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')", "type": "CWE"}]}], "affected": [{"vendor": "CervantesSec", "product": "cervantes", "versions": [{"status": "affected", "version": "alpha 0.3", "lessThanOrEqual": "1.3-beta", "versionType": "custom"}, {"status": "unaffected", "version": "v.1.4.0-beta"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cervantessec:cervantes:*:*:*:*:*:*:*:*", "versionStartIncluding": "alpha_0.3", "versionEndIncluding": "1.3-beta"}, {"vulnerable": false, "criteria": "cpe:2.3:a:cervantessec:cervantes:v.1.4.0-beta:*:*:*:*:*:*:*"}]}]}], "descriptions": [{"lang": "en", "value": "Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO\nin Cervantes version v1.3-beta could allow an attacker to execute arbitrary code in another user's browser with elevated privileges", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Stored XSS via avatar upload chained with an authentication bypass in /Attachments leads to ATO\nin Cervantes version v1.3-beta could allow an attacker to execute arbitrary code in another user's browser with elevated privileges"}]}], "references": [{"url": "https://www.grayback.es/advisories", "tags": ["patch"]}, {"url": "https://www.grayback.es/en/advisories", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"}}], "credits": [{"lang": "en", "value": "Miguel Segovia Gil", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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