CVE-2021-22886

mediumpriority · track · 25EPSS 0.019 · 79 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.88% (79th) EPSS

CVSS 4.3 · medium

Is it mine?

5 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimary

affected products (5)

Products and version ranges known to be affected.

n/a Rocket.Chat≤ Fixed in 3.11, 3.10.5, 3.9.7, 3.8.8enisa_euvdEU
rocket.chat rocket.chat< 3.8.8nvdUScpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
rocket.chat rocket.chat3.10.0 → 3.10.5nvdUScpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
rocket.chat rocket.chat= 3.11.0nvdUScpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*
rocket.chat rocket.chat3.9.0 → 3.9.7nvdUScpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-03-26modified 2026-06-17

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+53008 more

references (10)

External citations — patches, advisories, analysis.

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