CVE-2021-22886
MEDIUM
6.1
CVSS Score
Published: March 26, 2021 at 06:15 PM UTC
Updated: June 17, 2026 at 03:37 AM UTC
1 product affected across 1 vendorChat Rocket Chat
Using Rocket.Chat by N/A?
Get instant alerts when new vulnerabilities affect Rocket.Chat - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM6.1
Exploit prediction
EPSS 2%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 3.8.83.10.0 ≤ v < 3.10.53.9.0 ≤ v < 3.9.73.11.0 rc03.11.0 rc13.11.0 rc23.11.0 rc33.11.0 rc43.11.0 rc53.11.0 rc63.11.0 rc7
Affected range stops below 3.10.5, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 3.11 (unaffected)
Affected range stops below 3.8.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.7, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (3)
x_refsource_MISCVendor Advisory
Source: [email protected]
https://docs.rocket.chat/guides/security/security-updatesx_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/RocketChat/Rocket.Chat/pull/20430CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card