CVE-2021-39205 json
DOM-based XSS/Content Spoofing via Prototype Pollution
published 2021-09-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-25586
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 69%
- public exploits
- 0
- none known
Summary
Jitsi Meet is an open source video conferencing application. Versions prior to 2.0.6173 are vulnerable to client-side cross-site scripting via injecting properties into JSON objects that were not properly escaped. There are no known incidents related to this vulnerability being exploited in the wild. This issue is fixed in Jitsi Meet version 2.0.6173. There are no known workarounds aside from upgrading.
Patch / fix
- 8x8 jitsi_meet 2.0.6173
- github.com/jitsi/jitsi-meet#9320 pull request
- github.com/jitsi/jitsi-meet#9404 pull request
Exploit prediction
1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- jitsi jitsi-meet
Classification
References
-
github.com
/jitsi/jitsi-meet/pull/9320
patch, third-party-advisory
-
github.com
/jitsi/jitsi-meet/pull/9404
patch, third-party-advisory
-
github.com
/jitsi/jitsi-meet/security/advisories/GHSA-6582-8v9q-v3fg
third-party-advisory
-
hackerone.com
/reports/1214493
permissions-required
Sources
- CVE List CVE-2021-39205
- NVD CVE-2021-39205
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.