{"id":"CVE-2026-23891","summary":"Decidim has a Cross-site scripting (XSS) vulnerability via user name field","details":"Decidim is a participatory democracy framework. In versions below 0.30.5 and 0.31.0.rc1 through 0.31.0, a stored code execution vulnerability in the user name field allows a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page, resulting in high confidentiality and integrity impact across security boundaries. This issue has been fixed in versions 0.30.5 and 0.31.1.","aliases":["GHSA-fc46-r95f-hq7g"],"modified":"2026-08-12T03:51:14.034818637Z","published":"2026-04-13T16:52:16.448Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23891.json"},"references":[{"type":"WEB","url":"https://github.com/decidim/decidim/releases/tag/v0.30.5"},{"type":"WEB","url":"https://github.com/decidim/decidim/releases/tag/v0.31.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23891.json"},{"type":"ADVISORY","url":"https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23891"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/decidim/decidim","events":[{"introduced":"0"},{"fixed":"ed4d23c283cb03d3423493aeb5a7860bc8f5bfa3"},{"introduced":"0795da14454a4fb342d70654bdc267d1d6d5bca5"},{"fixed":"0a9443ed804ee6274fab904878bc0103af1c0f69"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.30.5"},{"introduced":"0.31.0"},{"fixed":"0.31.1"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:*"}}],"versions":["v0.30.4","v0.31.0","v0.30.3","v0.30.2","v0.30.1","v0.30.0","v0.30.0.rc3","v0.30.0.rc2","v0.30.0.rc1","v0.20.0","v0.5.0","v0.4.0","v0.3.0","v0.2.0","v0.1.0","v0.0.8.1","v0.0.8","v0.0.7","v0.0.6","v0.0.5","v0.0.4","v0.0.3","v0.0.2","v0.0.1","v0.0.1.alpha9","v0.0.1.alpha8","v0.0.1.alpha7","v0.0.1.alpha6","v0.0.1.alpha5","v0.0.1.alpha4","v0.0.1.alpha3","v0.0.1.alpha2","v0.0.1.alpha1","v0.0.1.alpha"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23891.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L"}]}