{"answers":{"affected":"1 open source package ship an affected version, including discourse.","exploited":"There is no known exploitation of CVE-2026-91121 in the wild and no public exploit code.","fix":"Upgrade discourse to 2026.8.0 or later.","what":"CVE-2026-91121 is a medium-severity cross-site scripting vulnerability in discourse, published on 24 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-2026-91121 and fix it if it is affected.\n\nWhat it is: CVE-2026-91121 is a medium-severity cross-site scripting vulnerability in discourse, published on 24 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-2026-91121 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- discourse (Bitnami): affected all versions; fixed in 2026.8.0\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-2026-91121/ (Markdown: https://insights.sbomify.com/CVE-2026-91121/index.md)","id":"CVE-2026-91121","markdown":"https://insights.sbomify.com/CVE-2026-91121/index.md","name":"CVE-2026-91121","record":{"aliases":["BIT-discourse-2026-91121","GHSA-34rh-wjfv-65gq"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Discourse forum","requires_auth":"low_privilege","summary":"Attackers can inject HTML into chat excerpts via malicious filenames, altering displayed content in various UI elements.","user_interaction":"not_required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, attacker-controlled upload filenames used in chat message excerpts were rendered as unescaped HTML. A user able to upload a file and send chat content could place markup in a filename that was then interpreted by chat channel lists, chat summary emails, pinned message bars, reply previews, thread previews, and other excerpt renderers. The issue allowed trusted-HTML injection that altered rendered excerpt content, but JavaScript execution was not demonstrated with default Content Security Policy settings. The advisory states that no confidentiality, integrity, or availability impact was identified, while its structured scoring metadata separately assigns low integrity impact. Sites that disable or relax the default CSP have increased exposure. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.","ecosystems":["Bitnami"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Discourse: Chat upload filenames rendered as raw HTML in excerpts","id":"CVE-2026-91121","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":1,"n_references":6,"next":{"headline":"Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users","id":"CVE-2026-91122"},"packages":[{"ecosystem":"Bitnami","fixed":["2026.8.0"],"introduced":["0"],"last_affected":[],"package":"discourse","purl":"pkg:bitnami/discourse","source":"BIT-discourse-2026-91121"}],"prev":{"headline":"Discourse: Stored HTML injection in video notification emails","id":"CVE-2026-91120"},"products":["discourse"],"published":"2026-09-24","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":"2026-09-24","vendors":["discourse"]},"summary":"Attackers can inject HTML into chat excerpts via malicious filenames, altering displayed content in various UI elements.","url":"https://insights.sbomify.com/CVE-2026-91121/"}