CVE-2026-27613

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{"affected": [{"affectedData": [{"product": "TinyWeb", "vendor": "maximmasiutin", "versions": [{"status": "affected", "version": "< 2.01"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:*", "matchCriteriaId": "B119C41C-4D84-41B3-8797-7DAD79FCF822", "versionEndExcluding": "2.01", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. A vulnerability in versions prior to 2.01 allows unauthenticated remote attackers to bypass the web server's CGI parameter security controls. Depending on the server configuration and the specific CGI executable in use, the impact is either source code disclosure or remote code execution (RCE). Anyone hosting CGI scripts (particularly interpreted languages like PHP) using vulnerable versions of TinyWeb is impacted. The problem has been patched in version 2.01. If upgrading is not immediately possible, ensure `STRICT_CGI_PARAMS` is enabled (it is defined by default in `define.inc`) and/or do not use CGI executables that natively accept dangerous command-line flags (such as `php-cgi.exe`). If hosting PHP, consider placing the server behind a Web Application Firewall (WAF) that explicitly blocks URL query string parameters that begin with a hyphen (`-`) or contain encoded double quotes (`%22`)."}, {"lang": "es", "value": "TinyWeb es un servidor web (HTTP, HTTPS) escrito en Delphi para Win32. Una vulnerabilidad en versiones anteriores a la 2.01 permite a atacantes remotos no autenticados eludir los controles de seguridad de par\u00e1metros CGI del servidor web. Dependiendo de la configuraci\u00f3n del servidor y del ejecutable CGI espec\u00edfico en uso, el impacto es la divulgaci\u00f3n de c\u00f3digo fuente o la ejecuci\u00f3n remota de c\u00f3digo (RCE). Cualquiera que aloje scripts CGI (particularmente lenguajes interpretados como PHP) usando versiones vulnerables de TinyWeb est\u00e1 afectado. El problema ha sido parcheado en la versi\u00f3n 2.01. Si la actualizaci\u00f3n no es posible de inmediato, aseg\u00farese de que `STRICT_CGI_PARAMS` est\u00e9 habilitado (est\u00e1 definido por defecto en `define.inc`) y/o no utilice ejecutables CGI que acepten de forma nativa indicadores de l\u00ednea de comandos peligrosos (como `php-cgi.exe`). Si aloja PHP, considere colocar el servidor detr\u00e1s de un cortafuegos de aplicaciones web (WAF) que bloquee expl\u00edcitamente los par\u00e1metros de cadena de consulta de URL que comienzan con un guion (`-`) o contienen comillas dobles codificadas (`%22`)."}], "id": "CVE-2026-27613", "lastModified": "2026-06-17T10:27:23.790", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 10.0, "baseSeverity": "CRITICAL", "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": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27613", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-26T20:22:05.675781Z", "version": "2.0.3"}}]}, "published": "2026-02-25T23:16:21.743", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/maximmasiutin/TinyWeb/commit/d9dbda8db49da69d2160e1c527e782b73b5ffb6b"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/maximmasiutin/TinyWeb/releases/tag/v2.01"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-rfx5-fh9m-9jj9"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://www.masiutin.net/tinyweb-cve-2026-27613.html"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-88"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.01)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "TinyWeb", "source": "cna", "vendor": "maximmasiutin"}, "product": "tinyweb", "vendor": "maximmasiutin"}], "analysis": {"en": {"generated_at": "2026-04-17T14:44:49.590176+00:00", "value": {"mitigation_remediation": ["Upgrade to TinyWeb version 2.01 or later to apply the vendor patch. ", "Recompile the server with the STRICT_CGI_PARAMS define enabled, which is the default in define.inc. ", "Remove or replace CGI executables that accept dangerous command\u2011line flags such as php\u2011cgi.exe, or reconfigure them to reject such parameters. ", "Deploy a Web Application Firewall that blocks URL query string parameters that start with a hyphen or contain encoded double quotes (%22)."], "summary": {"action": "Immediate Patch", "impact": "Remote code execution or source code disclosure via CGI parameter bypass"}, "threat_synthesis": {"affected_systems": "All installations of TinyWeb by Maxim Masutin (RITLabs) running versions earlier than 2.01 are affected. The problem was resolved in release 2.01. Users running a web server that hosts CGI scripts\u2014especially interpreted languages such as PHP\u2014are at risk.", "description_and_impact": "A flaw in TinyWeb before version 2.01 allows an unauthenticated attacker to bypass the server\u2019s CGI parameter filtering, enabling the injection of arbitrary command-line arguments or credentials. Depending on the CGI executable used and the server configuration, the attacker may obtain source code or execute arbitrary commands on the host system. The vulnerability arises from missing validation of CGI parameters, in particular the inability to enforce STRICT_CGI_PARAMS and improper handling of EscapeShellParam escaping.", "risk_and_exploitability": "The CVSS score of 10 indicates the highest severity. The EPSS score of less than 1% suggests a very low probability of exploitation in the wild, and the vulnerability is not listed in CISA\u2019s KEV catalog. Exploitation requires only an HTTP request containing specially crafted CGI parameters; an attacker does not need authentication or elevated privileges. The attack surface is remote and can target any accessible TinyWeb instance vulnerable to this bypass."}}}}, "created": "2026-02-26T13:10:43.007823+00:00", "updated": "2026-04-17T14:45:21.044842+00:00", "vendors": ["maximmasiutin", "maximmasiutin$PRODUCT$tinyweb"]}