XSS in Convos
CVE-2022-21650
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Convos
- Convos-Chat Convos — versions >= 6.48, < 6.52
Weakness classification (CWE)
Public proof-of-concept exploits
References
- blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/ (Broken Link)
- github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5df (Patch, Third Party Advisory)
- www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/ (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-21650?
- CVE-2022-21650 is a high-severity vulnerability in Convos, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2022-01-04.
- How severe is CVE-2022-21650?
- High severity. CVSS v3 base score is 7.6 out of 10.
- Is CVE-2022-21650 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.