{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-25923", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-09T16:22:17.785Z", "datePublished": "2026-02-09T21:56:02.862Z", "dateUpdated": "2026-02-11T21:20:25.222Z"}, "containers": {"cna": {"title": "Phar Deserialization leading to Arbitrary File Deletion in my little forum", "problemTypes": [{"descriptions": [{"cweId": "CWE-434", "lang": "en", "description": "CWE-434: Unrestricted Upload of File with Dangerous Type", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-502", "lang": "en", "description": "CWE-502: Deserialization of Untrusted Data", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw"}, {"name": "https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1"}], "affected": [{"vendor": "My-Little-Forum", "product": "mylittleforum", "versions": [{"version": "< 20260208.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-09T21:56:02.862Z"}, "descriptions": [{"lang": "en", "value": "my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1."}], "source": {"advisory": "GHSA-wr9p-3c3g-78fw", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-11T21:20:19.689679Z", "id": "CVE-2026-25923", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-11T21:20:25.222Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mylittleforum:my_little_forum:*:*:*:*:*:*:*:*", "matchCriteriaId": "B3238E69-543A-4C90-983B-E6DBD9A9ECBA", "versionEndExcluding": "20260208.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1."}, {"lang": "es", "value": "mi peque\u00f1o foro es un foro de internet basado en PHP y MySQL que muestra los mensajes en vista cl\u00e1sica de hilos. Antes de 20260208.1, la aplicaci\u00f3n no filtra el protocolo phar:// en la validaci\u00f3n de URL, permitiendo a los atacantes subir un archivo Phar Polyglot malicioso (disfrazado como JPEG) a trav\u00e9s de la funci\u00f3n de subida de im\u00e1genes, activar la deserializaci\u00f3n de Phar a trav\u00e9s del procesamiento de la etiqueta BBCode [img], y explotar la cadena POP de Smarty 4.1.0 para lograr la eliminaci\u00f3n arbitraria de archivos. Esta vulnerabilidad est\u00e1 corregida en 20260208.1."}], "id": "CVE-2026-25923", "lastModified": "2026-03-17T20:30:28.337", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "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": 8.7, "baseSeverity": "HIGH", "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": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-02-09T22:16:04.460", "references": [{"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-434"}, {"lang": "en", "value": "CWE-502"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,20260208.1)"}}], "product": "my_little_forum", "vendor": "my_little_forum"}], "analysis": {"en": {"generated_at": "2026-04-17T21:06:03.418269+00:00", "value": {"mitigation_remediation": ["Update MyLittleForum to version 20260208.1 or newer.", "Configure the web server or PHP to reject the \u2018phar://\u2019 protocol in URLs, for example by filtering input paths or adjusting wrapper settings.", "Disable or limit BBCode [img] tag processing until the fix is applied, or closely monitor upload content for malformed or unexpected files and block suspicious submissions."], "summary": {"action": "Apply Patch", "impact": "Arbitrary File Deletion"}, "threat_synthesis": {"affected_systems": "Versions of My-Little-Forum released before 20260208.1 are affected. All clients running the application\u2019s image upload and BBCode parsing components prior to this patch are vulnerable.", "description_and_impact": "A flaw in My-Little-Forum\u2019s image upload validation permits the PHP archive protocol to reach the BBCode [img] tag processor. By uploading a malicious Phar Polyglot file that masquerades as a JPEG, an attacker can trigger the Smarty templating engine\u2019s deserialization routine and exploit a known POP chain to delete files owned by the application. This results in the loss of critical data or configuration files and can cripple forum availability while potentially facilitating further compromise. The weakness is identified as both unsafe deserialization (CWE-502) and hazardous file deletion (CWE-434).", "risk_and_exploitability": "The vulnerability scores a CVSS of 8.7, indicating high severity. The EPSS score is less than 1%, suggesting that exploitation attacks are rare or difficult to execute. The issue is not currently listed in the CISA Known Exploited Vulnerability catalog. The likely attack vector is through the publicly accessible image upload endpoint; an attacker can craft an upload with a phar:// URL embedded in an [img] tag, causing the server to delete arbitrary files the application can reach. Successful exploitation would undermine availability and could be leveraged for additional attacks on the system."}}}}, "created": "2026-02-10T15:37:24.426946+00:00", "updated": "2026-04-17T21:15:27.379254+00:00", "vendors": ["my_little_forum", "my_little_forum$PRODUCT$my_little_forum"]}