Vulnerability Details : CVE-2021-22886
Rocket.Chat before 3.11, 3.10.5, 3.9.7, 3.8.8 is vulnerable to persistent cross-site scripting (XSS) using nested markdown tags allowing a remote attacker to inject arbitrary JavaScript in a message. This flaw leads to arbitrary file read and RCE on Rocket.Chat desktop app.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2021-22886
- cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc0:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc4:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc5:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc6:*:*:*:*:*:*
- cpe:2.3:a:rocket.chat:rocket.chat:3.11.0:rc7:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-22886
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-22886
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
2.8
|
2.7
|
NIST |
CWE ids for CVE-2021-22886
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by:
- nvd@nist.gov (Primary)
- support@hackerone.com (Secondary)
References for CVE-2021-22886
-
https://github.com/RocketChat/Rocket.Chat/pull/20430
Security sync by sampaiodiego · Pull Request #20430 · RocketChat/Rocket.Chat · GitHubPatch;Third Party Advisory
-
https://docs.rocket.chat/guides/security/security-updates
Security fixes and updates - Rocket.Chat DocsVendor Advisory
-
https://hackerone.com/reports/1014459
HackerOneThird Party Advisory
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