Stored XSS via html file upload in convos
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.6epss 0.8%
exploitation probability
0.8%top 44% of all CVEs
observed exploitation
nono source reports it
Convos is an open source multi-user chat that runs in a web browser. You can't use SVG extension in Convos' chat window, but you can upload a file with an .html extension. By uploading an SVG file with an html extension the upload filter can be bypassed. This causes Stored XSS. Also, after uploading a file the XSS attack is triggered upon a user viewing the file. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Affected products
convos-chat · convosReferences
https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerabilityhttps://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5dfhttps://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/