{"id":"CVE-2026-15311","state":"PUBLISHED","title":"NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting","description":"A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulation leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.","publishedAt":"2026-07-09T23:45:10.318Z","updatedAt":"2026-07-10T14:12:45.061Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","source":"VulDB"},"assigner":"VulDB","products":["NousResearch hermes-agent"],"affected":[{"vendor":"NousResearch","product":"hermes-agent","versions":[{"version":"2026.5.29.0","status":"affected"},{"version":"2026.5.29.1","status":"affected"},{"version":"2026.5.29.2","status":"affected"}],"cpes":["cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"],"modules":["Matrix Adapter"]}],"references":["https://vuldb.com/vuln/377247","https://vuldb.com/vuln/377247/cti","https://vuldb.com/cve/CVE-2026-15311","https://vuldb.com/submit/852843","https://github.com/NousResearch/hermes-agent/issues/42667","https://github.com/NousResearch/hermes-agent/pull/42759","https://github.com/NousResearch/hermes-agent/"],"weaknesses":["CWE-79","CWE-94"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/15xxx/CVE-2026-15311.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-15311","state":"PUBLISHED","datePublished":"2026-07-09T23:45:10.318Z","dateUpdated":"2026-07-10T14:12:45.061Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-07-09T17:49:30.256Z"},"containers":{"cna":{"title":"NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting","descriptions":[{"lang":"en","value":"A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulation leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance."}],"affected":[{"vendor":"NousResearch","product":"hermes-agent","versions":[{"version":"2026.5.29.0","status":"affected"},{"version":"2026.5.29.1","status":"affected"},{"version":"2026.5.29.2","status":"affected"}],"cpes":["cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"],"modules":["Matrix Adapter"]}],"references":[{"url":"https://vuldb.com/vuln/377247","name":"VDB-377247 | NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/vuln/377247/cti","name":"VDB-377247 | CTI Indicators (IOB, IOC, TTP, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-15311","name":"CVE-2026-15311 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/852843","name":"Submit #852843 | NousResearch hermes-agent 2026.5.29.2 Cross-site Scripting (CWE-79)","tags":["third-party-advisory"]},{"url":"https://github.com/NousResearch/hermes-agent/issues/42667","tags":["exploit","issue-tracking"]},{"url":"https://github.com/NousResearch/hermes-agent/pull/42759","tags":["issue-tracking","patch"]},{"url":"https://github.com/NousResearch/hermes-agent/","tags":["product"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":5.1,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":3.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C","baseSeverity":"LOW"}},{"cvssV3_0":{"version":"3.0","baseScore":3.5,"vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C","baseSeverity":"LOW"}},{"cvssV2_0":{"version":"2.0","baseScore":4,"vectorString":"AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","type":"CWE","lang":"en","description":"Cross Site Scripting"}]},{"descriptions":[{"cweId":"CWE-94","type":"CWE","lang":"en","description":"Code Injection"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-07-09T23:45:10.318Z"},"timeline":[{"time":"2026-07-09T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-07-09T02:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-07-09T19:54:35.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"Eric-d (VulDB User)","type":"reporter"},{"lang":"en","value":"VulDB CNA Team","type":"coordinator"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-10T14:12:35.059940Z","id":"CVE-2026-15311","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-10T14:12:45.061Z"}}]}}}