{"id":"CVE-2020-26547","aliases":["EUVD-2020-19092","GHSA-rf7j-w28r-v7m8"],"status":"published","title":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP...","description":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP-0280) results. This allows a remote attacker (able to send stanzas to a victim) to inject arbitrary messages into the local history, with full control over the sender and receiver displayed to the victim.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00555,"percentile":0.46786,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-345"],"published":"2021-02-01T01:02:54Z","modified":"2026-06-17T03:08:10Z","products":[{"vendor":"monal","product":"monal"}],"references":[{"url":"https://github.com/anurodhp/Monal/commits/develop","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://monal.im/blog/cve-2020-26547/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26547"},{"url":"https://github.com/advisories/GHSA-rf7j-w28r-v7m8"}],"sources":{"cve":[{"id":"CVE-2020-26547","description":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP-0280) results. This allows a remote attacker (able to send stanzas to a victim) to inject arbitrary messages into the local history, with full control over the sender and receiver displayed to the victim.","status":"published","published":"2021-02-01T01:02:54Z","modified":"2024-08-04T15:56:04.529Z","updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2020-19092","description":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP-0280) results. This allows a remote attacker (able to send stanzas to a victim) to inject arbitrary messages into the local history, with full control over the sender and receiver displayed to the victim.","status":"published","published":"2021-02-01T01:02:54Z","modified":"2024-08-04T15:56:04Z","updated_at":"2026-11-03T03:07:15.15938Z"}],"ghsa":[{"id":"GHSA-rf7j-w28r-v7m8","title":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP...","description":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP-0280) results. This allows a remote attacker (able to send stanzas to a victim) to inject arbitrary messages into the local history, with full control over the sender and receiver displayed to the victim.","status":"published","published":"2022-05-24T17:40:44Z","modified":"2023-01-29T05:05:33Z","cwes":["CWE-345"],"updated_at":"2026-11-02T14:45:49.336023Z"}],"nvd":[{"id":"CVE-2020-26547","description":"Monal before 4.9 does not implement proper sender verification on MAM and Message Carbon (XEP-0280) results. This allows a remote attacker (able to send stanzas to a victim) to inject arbitrary messages into the local history, with full control over the sender and receiver displayed to the victim.","status":"published","published":"2021-02-01T02:15:15.377Z","modified":"2026-06-17T03:08:10.337Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T14:06:30.596418Z"}]}}