CVE-2022-21650
By uploading an SVG file with an html extension the upload filter can be bypassed.
Does this matter?
Lower severity and a low EPSS score (0.83%). Track it; it rarely justifies an emergency change on its own.
Description
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
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.83% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- convos/convos
- Source
- security-advisories@github.com
References
- https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerabilityBroken Link
- https://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5dfPatch, Third Party Advisory
- https://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695Patch, Third Party Advisory
- https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/Exploit, Issue Tracking, Patch, Third Party Advisory
- https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerabilityBroken Link
- https://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5dfPatch, Third Party Advisory
- https://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695Patch, Third Party Advisory
- https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/Exploit, Issue Tracking, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.