CVE-2022-21649 json
Stored XSS via attribute in convos
published 2022-01-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-26870
- cvss
- 7.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
Convos is an open source multi-user chat that runs in a web browser. Characters starting with "https://" in the chat window create an <a> tag. Stored XSS vulnerability using onfocus and autofocus occurs because escaping exists for "<" or ">" but escaping for double quotes does not exist. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.
Patch / fix
- convos convos 6.52
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://www.huntr.dev/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Affected products
- convos-chat convos
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/convos-chat/convos/commit/86b2193de375005ba71d9dd53843562c6ac1847c
patch, third-party-advisory
-
huntr.dev
/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/
exploit, patch, third-party-advisory
-
github.com
/convos-chat/convos/security/advisories/GHSA-xmpj-xwm3-vww7
patch, third-party-advisory
-
blog.pocas.kr
/2021/12/30/2021-12-30-s-xss-convos-chat/#Second-vulnerability
broken-link, third-party-advisory
Sources
- CVE List CVE-2022-21649
- NVD CVE-2022-21649
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.