{"id":"CVE-2023-38700","aliases":["EUVD-2023-2268","GHSA-c7hh-3v6c-fj4q"],"status":"published","title":"matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms","description":"matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00599,"percentile":0.48994,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2023-08-04T17:26:07Z","modified":"2026-10-28T02:30:55Z","fixes":[{"ecosystem":"npm","package":"matrix-appservice-irc","fixed_in":["1.0.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"matrix-appservice-irc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.0.0"},{"fixed":"1.0.1"}]}]},{"source":"osv","ecosystem":"npm","package":"matrix-appservice-irc","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.1"}]}]}],"products":[{"vendor":"matrix","product":"matrix_irc_bridge"},{"vendor":"matrix-org","product":"matrix-appservice-irc"}],"references":[{"url":"https://github.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-c7hh-3v6c-fj4q","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://github.com/matrix-org/matrix-appservice-irc/commit/8bbd2b69a16cbcbeffdd9b5c973fd89d61498d75","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://github.com/matrix-org/matrix-appservice-irc/releases/tag/1.0.1","tags":["x_refsource_MISC","x_transferred","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-38700","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c7hh-3v6c-fj4q"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/38xxx/CVE-2023-38700.json","tags":["advisory"]},{"url":"https://github.com/matrix-org/matrix-appservice-irc","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-38700","title":"matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms","description":"matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.","status":"published","published":"2023-08-04T18:05:43.187Z","modified":"2024-10-03T18:08:51.929Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:35:30.116696Z"}],"euvd":[{"id":"EUVD-2023-2268","description":"matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.","status":"published","published":"2023-08-04T18:05:43Z","modified":"2024-10-03T18:08:51Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-03T00:27:53.790276Z"}],"ghsa":[{"id":"GHSA-c7hh-3v6c-fj4q","title":"matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms","description":"### Impact\n\nIt was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target.\n\n### Patches\n\nPlease upgrade to 1.0.1.\n\n### Workarounds\n\nYou can set the `matrixHandler.eventCacheSize` config value to `0` to workaround this bug. However, this may impact performance.\n\n### Credits\n\nDiscovered and reported by [Val Lorentz](https://valentin-lorentz.fr/).\n\n### For more information\n\nIf you have any questions or comments about this advisory email us at [security@matrix.org](mailto:security@matrix.org).","status":"published","published":"2023-08-04T17:26:07Z","modified":"2023-11-12T05:02:19Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:37:21.209096Z"}],"nvd":[{"id":"CVE-2023-38700","description":"matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.","status":"published","published":"2023-08-04T19:15:09.697Z","modified":"2026-06-17T06:10:58.86Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:08:20.798312Z"}],"osv":[{"id":"CVE-2023-38700","title":"matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms","description":"matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.","status":"published","published":"2023-08-04T18:05:43.187Z","modified":"2026-10-28T02:30:55.594545683Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:44:32.922049Z"},{"id":"GHSA-c7hh-3v6c-fj4q","title":"matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms","description":"### Impact\n\nIt was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target.\n\n### Patches\n\nPlease upgrade to 1.0.1.\n\n### Workarounds\n\nYou can set the `matrixHandler.eventCacheSize` config value to `0` to workaround this bug. However, this may impact performance.\n\n### Credits\n\nDiscovered and reported by [Val Lorentz](https://valentin-lorentz.fr/).\n\n### For more information\n\nIf you have any questions or comments about this advisory email us at [security@matrix.org](mailto:security@matrix.org).","status":"published","published":"2023-08-04T17:26:07Z","modified":"2023-11-08T04:13:09.727778Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:46:44.571161Z"}]}}