{"id":"CVE-2026-118129","state":"PUBLISHED","title":"jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication","description":"A vulnerability was found in jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc. The affected element is the function isConfigMessageEvent of the file src/Bootstrap.tsx of the component PostMessage Handler. Performing a manipulation of the argument parentDomain results in improper authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided. The patch is named e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688. It is recommended to apply a patch to fix this issue. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.","publishedAt":"2026-10-27T23:15:19.571Z","updatedAt":"2026-10-27T23:15:19.571Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","source":"VulDB"},"assigner":"VulDB","products":["jeremyckahn Chitchatter"],"affected":[{"vendor":"jeremyckahn","product":"Chitchatter","versions":[{"version":"f82538633813c854a81a8b2112a2f6ba17b39cbc","status":"affected"}],"cpes":["cpe:2.3:a:jeremyckahn:chitchatter:*:*:*:*:*:*:*:*"],"modules":["PostMessage Handler"]}],"references":["https://vuldb.com/vuln/427456","https://vuldb.com/vuln/427456/cti","https://vuldb.com/cve/CVE-2026-118129","https://vuldb.com/submit/1015027","https://github.com/0xGenesi/CVE/blob/main/Chitchatter_SDK_postMessage_Identity_Key_Injection.md","https://github.com/jeremyckahn/chitchatter/pull/635","https://github.com/jeremyckahn/chitchatter/commit/e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688","https://github.com/jeremyckahn/chitchatter/"],"weaknesses":["CWE-287"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118129.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118129","state":"PUBLISHED","datePublished":"2026-10-27T23:15:19.571Z","dateUpdated":"2026-10-27T23:15:19.571Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-10-27T16:48:08.665Z"},"containers":{"cna":{"title":"jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication","descriptions":[{"lang":"en","value":"A vulnerability was found in jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc. The affected element is the function isConfigMessageEvent of the file src/Bootstrap.tsx of the component PostMessage Handler. Performing a manipulation of the argument parentDomain results in improper authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided. The patch is named e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688. It is recommended to apply a patch to fix this issue. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product."}],"affected":[{"vendor":"jeremyckahn","product":"Chitchatter","versions":[{"version":"f82538633813c854a81a8b2112a2f6ba17b39cbc","status":"affected"}],"cpes":["cpe:2.3:a:jeremyckahn:chitchatter:*:*:*:*:*:*:*:*"],"modules":["PostMessage Handler"]}],"references":[{"url":"https://vuldb.com/vuln/427456","name":"VDB-427456 | jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/vuln/427456/cti","name":"VDB-427456 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-118129","name":"CVE-2026-118129 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/1015027","name":"Submit #1015027 | jeremyckahn Chitchatter develop branch @ 23b62a8 (source) authentication bypass / identity takeover","tags":["third-party-advisory"]},{"url":"https://github.com/0xGenesi/CVE/blob/main/Chitchatter_SDK_postMessage_Identity_Key_Injection.md","tags":["exploit"]},{"url":"https://github.com/jeremyckahn/chitchatter/pull/635","tags":["issue-tracking","patch"]},{"url":"https://github.com/jeremyckahn/chitchatter/commit/e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688","tags":["patch"]},{"url":"https://github.com/jeremyckahn/chitchatter/","tags":["product"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":5.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":6.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","baseSeverity":"MEDIUM"}},{"cvssV3_0":{"version":"3.0","baseScore":6.3,"vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C","baseSeverity":"MEDIUM"}},{"cvssV2_0":{"version":"2.0","baseScore":7.5,"vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","type":"CWE","lang":"en","description":"Improper Authentication"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-10-27T23:15:19.571Z"},"timeline":[{"time":"2026-10-27T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-10-27T01:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-10-27T17:57:58.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"chenhuanlin (VulDB User)","type":"reporter"},{"lang":"en","value":"VulDB CNA Team","type":"coordinator"}],"tags":["x_open-source"],"x_generator":["VulDB PVTS v202610"]}}}}