CVE-2026-27626

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{"affected": [{"affectedData": [{"product": "OliveTin", "vendor": "OliveTin", "versions": [{"status": "affected", "version": "<= 3000.10.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:olivetin:olivetin:*:*:*:*:*:*:*:*", "matchCriteriaId": "E09DB368-3973-4282-A0B6-5576CB6CCD5C", "versionEndIncluding": "3000.10.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OliveTin gives access to predefined shell commands from a web interface. In versions up to and including 3000.10.0, OliveTin's shell mode safety check (`checkShellArgumentSafety`) blocks several dangerous argument types but not `password`. A user supplying a `password`-typed argument can inject shell metacharacters that execute arbitrary OS commands. A second independent vector allows unauthenticated RCE via webhook-extracted JSON values that skip type safety checks entirely before reaching `sh -c`. When exploiting vector 1, any authenticated user (registration enabled by default, `authType: none` by default) can execute arbitrary OS commands on the OliveTin host with the permissions of the OliveTin process. When exploiting vector 2, an unauthenticated attacker can achieve the same if the instance receives webhooks from external sources, which is a primary OliveTin use case. When an attacker exploits both vectors, this results in unauthenticated RCE on any OliveTin instance using Shell mode with webhook-triggered actions. As of time of publication, a patched version is not available."}, {"lang": "es", "value": "OliveTin da acceso a comandos de shell predefinidos desde una interfaz web. En versiones hasta la 3000.10.0 inclusive, la comprobaci\u00f3n de seguridad del modo shell de OliveTin ('checkShellArgumentSafety') bloquea varios tipos de argumentos peligrosos, pero no 'password'. Un usuario que proporciona un argumento de tipo 'password' puede inyectar metacaracteres de shell que ejecutan comandos arbitrarios del sistema operativo. Un segundo vector independiente permite RCE no autenticada a trav\u00e9s de valores JSON extra\u00eddos de webhooks que omiten por completo las comprobaciones de seguridad de tipo antes de llegar a 'sh -c'. Al explotar el vector 1, cualquier usuario autenticado (registro habilitado por defecto, 'authType: none' por defecto) puede ejecutar comandos arbitrarios del sistema operativo en el host de OliveTin con los permisos del proceso de OliveTin. Al explotar el vector 2, un atacante no autenticado puede lograr lo mismo si la instancia recibe webhooks de fuentes externas, lo cual es un caso de uso principal de OliveTin. Cuando un atacante explota ambos vectores, esto resulta en RCE no autenticada en cualquier instancia de OliveTin que utiliza el modo Shell con acciones activadas por webhook. En el momento de la publicaci\u00f3n, no hay disponible una versi\u00f3n parcheada."}], "id": "CVE-2026-27626", "lastModified": "2026-06-17T10:27:24.823", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27626", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-27T17:07:18.531616Z", "version": "2.0.3"}}]}, "published": "2026-02-25T03:16:06.347", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-49gm-hh7w-wfvf"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/OliveTin/OliveTin/security/advisories/GHSA-49gm-hh7w-wfvf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3000.10.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OliveTin", "source": "cna", "vendor": "OliveTin"}, "product": "olivetin", "vendor": "olivetin"}], "analysis": {"en": {"generated_at": "2026-04-18T10:49:04.387917+00:00", "value": {"mitigation_remediation": ["Restrict network access to the OliveTin API and UI to trusted IP ranges or within a protected network segment.", "Disable or tightly control webhook endpoints so that only specially authorized services can send payloads, or block webhooks entirely if they are not required.", "Run OliveTin under a dedicated low\u2011privilege user account so that any executed commands run with minimal system permissions."], "summary": {"action": "Monitor", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "OliveTin versions up to and including 3000.10.0 are affected. No patched version is available at the time of publication, and the application is commonly deployed as a local service with default authentication settings that can allow users to submit webhook calls or shell commands.", "description_and_impact": "OliveTin exposes predefined shell commands through a web interface. In versions up to 3000.10.0, the safety check that blocks unsafe argument types fails to protect arguments of type `password`. An attacker can supply a `password` argument that contains shell metacharacters, leading to arbitrary OS command execution. The vulnerability also allows a second independent vector via webhook\u2011extracted JSON values that bypass type safety checks before being passed to the shell. Together, these vectors enable Remote Code Execution with the privileges of the OliveTin process. The known weakness is CWE\u201178.", "risk_and_exploitability": "The vulnerability carries a CVSS score of 10.0 and an EPSS score of less than 1\u202f%, indicating low current exploitation likelihood but very high impact if exploited. Since the issue is not listed in CISA\u2019s KEV catalog, there is no known widespread active exploitation. An attacker could trigger the vulnerability remotely over HTTP, either by sending a crafted shell command request or by posting a webhook payload. Authenticated users (or all users when authentication is disabled) can perform the attack, and unauthenticated users can succeed if the instance accepts external webhooks. The high severity and ability to achieve full RCE warrant immediate mitigation."}}}}, "created": "2026-02-25T11:34:57.053812+00:00", "updated": "2026-04-18T11:00:05.734903+00:00", "vendors": ["olivetin", "olivetin$PRODUCT$olivetin"]}