{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-66548 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-66548 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-66548 is a low-severity vulnerability in nextcloud security-advisories, published on 5 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-66548 and fix it if it is affected.\n\nWhat it is: CVE-2025-66548 is a low-severity vulnerability in nextcloud security-advisories, published on 5 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-66548 in the wild and no public exploit code.\n\nAffected product: nextcloud security-advisories. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-66548/ (Markdown: https://insights.sbomify.com/CVE-2025-66548/index.md)","id":"CVE-2025-66548","markdown":"https://insights.sbomify.com/CVE-2025-66548/index.md","name":"CVE-2025-66548","record":{"aliases":["GHSA-xjvq-xvr7-xpg6"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["other"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Nextcloud Deck app","requires_auth":"low_privilege","summary":"Attackers can spoof file extensions using RTLO characters to trick users into downloading malicious files, requiring an upgrade to the Nextcloud Deck app.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"deck","vendor":"nextcloud"}],"cvss":{"score":3.3,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-116","name":"Improper Encoding or Escaping of Output"}],"description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Nextcloud Deck app allows to spoof file extensions by using RTLO characters","id":"CVE-2025-66548","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end encrypted directory","id":"CVE-2025-66549"},"packages":[],"prev":{"headline":"Nextcloud Server users can modify tags on files that do not belong to them","id":"CVE-2025-66547"},"products":["security-advisories"],"published":"2025-12-05","related":[{"cvss_score":8.1,"headline":"Missing permission check on Deck API","id":"CVE-2021-39225","kev_date_added":null,"published":"2021-10-25"},{"cvss_score":8,"headline":"Missing authorization in Nextcloud Deck","id":"CVE-2020-8182","kev_date_added":null,"published":"2020-10-05"},{"cvss_score":6.5,"headline":"Circle can be accessed by non-Circle members in Nextcloud Deck","id":"CVE-2021-37631","kev_date_added":null,"published":"2021-09-07"},{"cvss_score":6.5,"headline":"Information disclosure in Nextcloud Deck","id":"CVE-2021-22913","kev_date_added":null,"published":"2021-06-11"},{"cvss_score":5.8,"headline":"Nextcloud Deck card vulnerable to data leak to unauthorized users via reference preview cache","id":"CVE-2023-22469","kev_date_added":null,"published":"2023-01-10"},{"cvss_score":5.4,"headline":"Nextcloud Deck app allowed user with \"Can share\" permission to modify permissions of other non-owners","id":"CVE-2025-66557","kev_date_added":null,"published":"2025-12-05"},{"cvss_score":5,"headline":"Possibility for anyone to add a stack with existing tasks on anyone's board in Nextcloud Deck","id":"CVE-2022-29159","kev_date_added":null,"published":"2022-05-20"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-12-08","vendors":["nextcloud"]},"summary":"Attackers can spoof file extensions using RTLO characters to trick users into downloading malicious files, requiring an upgrade to the Nextcloud Deck app.","url":"https://insights.sbomify.com/CVE-2025-66548/"}