CVE-2026-35537

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.5.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.6.0,1.6.14)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Webmail", "source": "cna", "vendor": "Roundcube"}, "product": "webmail", "vendor": "roundcube"}], "analysis": {"en": {"generated_at": "2026-04-13T20:50:52.206247+00:00", "value": {"mitigation_remediation": ["Upgrade Roundcube to a version equal to or later than 1.5.14 or 1.6.14.", "If an upgrade is not possible, disable the Redis/Memcache session handlers or configure them to reject unauthenticated session data.", "Restrict external access to the session storage backend or apply firewall rules to block unauthenticated write attempts."], "summary": {"action": "Patch Immediately", "impact": "Unauthenticated arbitrary file write via unsafe session deserialization"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all Roundcube Webmail installations running versions prior to 1.5.14 or 1.6.14 that use the Redis or Memcache session handling modules. Any deployment employing those session stores is susceptible.", "description_and_impact": "Roundcube Webmail contains an unsafe deserialization flaw in its Redis/Memcache session handler. When a crafted session payload is deserialized, the attacker can trigger arbitrary file write operations on the server. This allows overwrite or creation of files, potentially enabling the deployment of malicious scripts or the modification of configuration files.", "risk_and_exploitability": "The flaw carries a CVSS score of 3.7, indicating moderate severity, and an EPSS score of less than 1\u202f%, suggesting low likelihood of widespread exploitation. It is not listed in the CISA Known Exploited Vulnerabilities catalog. Attackers can execute the flaw without authentication by supplying a maliciously crafted session payload, granting the ability to write files wherever the webmail process has write permission."}}}}, "created": "2026-04-03T07:31:09.719625+00:00", "title": "Roundcube Webmail Unsafe Deserialization Enables Unauthenticated File Write via Session Data", "updated": "2026-04-14T16:41:51.677039+00:00", "vendors": ["roundcube", "roundcube$PRODUCT$webmail"]}