CVE-2026-26345

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The echapper_html_suspect() function does not adequately sanitize user-controlled content, allowing authenticated users with content-editing privileges (e.g., author-level roles and above) to inject malicious scripts. The injected payload may be rendered across multiple pages within the framework and execute in the browser context of other users, including administrators. Successful exploitation can allow attackers to perform actions in the security context of the victim user, including unauthorized modification of application state. This vulnerability is not mitigated by the SPIP security screen.</p>"}], "value": "SPIP before 4.4.8 contains a stored cross-site scripting (XSS) vulnerability in the public area triggered in certain edge-case usage patterns. The echapper_html_suspect() function does not adequately sanitize user-controlled content, allowing authenticated users with content-editing privileges (e.g., author-level roles and above) to inject malicious scripts. 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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.0,4.4.8)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "SPIP", "source": "cna", "vendor": "SPIP"}, "product": "spip", "vendor": "spip"}], "analysis": {"en": {"generated_at": "2026-04-16T16:55:31.878844+00:00", "value": {"mitigation_remediation": ["Upgrade to SPIP 4.4.8 or later to obtain the fix for the XSS flaw", "If an upgrade is not immediately possible, limit public\u2011area rendering of user\u2011generated HTML or apply a strict Content\u2011Security\u2011Policy to block script execution", "Perform a manual audit of all publicly accessible pages to locate and remove any embedded scripts that may have been injected by compromised editors"], "summary": {"action": "Patch", "impact": "Browser-based Privilege Escalation via XSS in public area"}, "threat_synthesis": {"affected_systems": "The flaw affects all SPIP installations using a version older than 4.4.8. Administrators, authors, and other users with editing rights are capable of crafting the malicious input that will be stored and later displayed in the public portion of the site. Older releases of SPIP that have not applied the 4.4.8 security update remain vulnerable.", "description_and_impact": "This vulnerability is a stored cross\u2011site scripting flaw in the echapper_html_suspect() function of SPIP versions prior to 4.4.8. The function fails to properly escape user\u2011controlled content, allowing an authenticated user with content\u2011editing privileges to inject JavaScript that is later rendered on multiple pages. When executed, the payload runs in the victim\u2019s browser context, enabling the attacker to perform actions with that user\u2019s permissions, including unauthorized modification of application state. The weakness is classified as CWE\u201179.", "risk_and_exploitability": "The CVSS score of 8.6 indicates a high severity, and the EPSS score of less than 1% suggests a low probability of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog, and it requires legitimate authenticated access with editing rights. Exploitation still demands that the attacker be able to author content that will be publicly displayed, after which the script executes in the context of any viewer, including administrators. The combination of a high CVSS score and the limited attack surface implies that while the potential impact is serious, the likelihood of widespread exploitation remains modest."}}}}, "created": "2026-02-20T10:06:30.852730+00:00", "updated": "2026-04-16T17:00:09.386796+00:00", "vendors": ["spip", "spip$PRODUCT$spip"]}