{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-100674 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-100674 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-100674 is a medium-severity vulnerability in stoatchat, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-100674 and fix it if it is affected.\n\nWhat it is: CVE-2026-100674 is a medium-severity vulnerability in stoatchat, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-100674 in the wild and no public exploit code.\n\nAffected product: stoatchat. 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-2026-100674/ (Markdown: https://insights.sbomify.com/CVE-2026-100674/index.md)","id":"CVE-2026-100674","markdown":"https://insights.sbomify.com/CVE-2026-100674/index.md","name":"CVE-2026-100674","record":{"aliases":["GHSA-j26j-r3xm-q4wf","GHSA-qcwh-c934-wrv5"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["security_bypass","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"stoatchat chat application","requires_auth":"low_privilege","summary":"Attackers can bypass username validation rules in stoatchat to create reserved-name lookalikes and embed forbidden characters by exploiting Unicode sanitization flaws.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-180","name":"Incorrect Behavior Order: Validate Before Canonicalize"}],"description":"stoatchat before 0.15.5 fails to revalidate usernames after Unicode sanitization, allowing attackers to create usernames with forbidden characters by submitting Unicode letters that transform into rejected characters. Attackers can bypass character allowlists and length limits to create reserved-name lookalikes, embed special characters, and exceed the 32-character storage limit.","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":"stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization","id":"CVE-2026-100674","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"stoatchat before 0.15.5 Denial of Service via mass mentions","id":"CVE-2026-100675"},"packages":[],"prev":{"headline":"Grav Data Manager before 1.4.5 Stored XSS via item-detail view","id":"CVE-2026-100673"},"products":["stoatchat"],"published":"2026-09-26","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-09-30","vendors":["stoatchat"]},"summary":"Attackers can bypass username validation rules in stoatchat to create reserved-name lookalikes and embed forbidden characters by exploiting Unicode sanitization flaws.","url":"https://insights.sbomify.com/CVE-2026-100674/"}