{"id":"CVE-2026-33386","aliases":["EUVD-2026-33339","GHSA-wq6v-xp72-v7h5"],"status":"published","title":"XSS in QuickCMS","description":"QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.\n\n\nThis issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.","severity":{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00185,"percentile":0.08208,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-05-29T15:12:20Z","modified":"2026-07-21T15:10:00Z","products":[{"vendor":"opensolution","product":"quickcms"}],"references":[{"url":"https://cert.pl/posts/2026/05/CVE-2026-33384/","tags":["third-party-advisory"]},{"url":"https://opensolution.org/home.html","tags":["product"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33386"},{"url":"https://cert.pl/posts/2026/05/CVE-2026-33384"},{"url":"https://github.com/advisories/GHSA-wq6v-xp72-v7h5"}],"sources":{"cve":[{"id":"CVE-2026-33386","title":"XSS in QuickCMS","description":"QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.\n\n\nThis issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.","status":"published","published":"2026-05-29T15:12:20.613Z","modified":"2026-05-29T17:31:36.344Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:08.009733Z"}],"euvd":[{"id":"EUVD-2026-33339","description":"QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.\n\n\nThis issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.","status":"published","published":"2026-05-29T15:12:20Z","modified":"2026-05-29T17:31:36Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"low"}],"updated_at":"2026-11-02T18:21:00.384456Z"}],"ghsa":[{"id":"GHSA-wq6v-xp72-v7h5","title":"QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin...","description":"QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.\n\n\nThis issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.","status":"published","published":"2026-05-29T18:31:33Z","modified":"2026-05-29T18:31:43Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:08:24.172092Z"}],"nvd":[{"id":"CVE-2026-33386","description":"QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.\n\n\nThis issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.","status":"published","published":"2026-05-29T16:16:25.56Z","modified":"2026-07-21T15:10:00.103Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:21.244426Z"}]}}