CVE-2026-65644
Rocket.Chat Cross-Site Scripting Vulnerability
Description
Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6, 8.3.8, 8.2.8, 8.1.8, and 7.10.15 has a REST API endpoint POST /api/v1/livechat/visitor that accepts an unauthenticated, unsanitized name field for Livechat visitors. This name is stored raw and later rendered via dangerouslySetInnerHTML in the Omnichannel Queue side panel (InquireSidePanelItem.tsx), injecting a real, clickable HTML link - pointing to any attacker-controlled domain, with arbitrary social-engineering text - into the DOM of any agent viewing the queue.
INFO
Published Date :
Aug. 21, 2026, 4:18 a.m.
Last Modified :
Sept. 4, 2026, 6:30 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Rocket.Chat to a secure version.
- Sanitize user-provided name fields in API.
- Validate input data for the Livechat visitor API.
- Avoid rendering raw HTML from user input.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-65644.
| URL | Resource |
|---|---|
| https://github.com/RocketChat/Rocket.Chat/pull/41595 | Patch Vendor Advisory |
| https://hackerone.com/reports/3872858 | Third Party Advisory Issue Tracking |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-65644 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-65644
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-65644 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-65644 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 04, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions up to (excluding) 7.10.15 *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions from (including) 8.2.0 up to (excluding) 8.2.8 *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions from (including) 8.3.0 up to (excluding) 8.3.8 *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions from (including) 8.4.0 up to (excluding) 8.4.6 *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions from (including) 8.5.0 up to (excluding) 8.5.3 *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions from (including) 8.6.0 up to (excluding) 8.6.2 *cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* versions from (including) 8.1.0 up to (excluding) 8.1.8 *cpe:2.3:a:rocket.chat:rocket.chat:8.7.0:*:*:*:*:*:*:* Added Reference Type HackerOne: https://github.com/RocketChat/Rocket.Chat/pull/41595 Types: Patch, Vendor Advisory Added Reference Type HackerOne: https://hackerone.com/reports/3872858 Types: Issue Tracking, Third Party Advisory -
CVE Modified by [email protected]
Aug. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/RocketChat/Rocket.Chat/pull/41595 Added Reference https://hackerone.com/reports/3872858 Removed Reference https://github.com/RocketChat/Rocket.Chat/pull/41595 Removed Reference https://hackerone.com/reports/3872858 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added SSVC {'id': 'CVE-2026-65644', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-27T19:19:28.284092Z'} -
New CVE Received by [email protected]
Aug. 21, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Rocket.Chat', 'product': 'Rocket.Chat', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '8.8.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.7.1', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.6.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.5.3', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.4.6', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.3.8', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.2.8', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '8.1.8', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '7.10.15', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6, 8.3.8, 8.2.8, 8.1.8, and 7.10.15 has a REST API endpoint POST /api/v1/livechat/visitor that accepts an unauthenticated, unsanitized name field for Livechat visitors. This name is stored raw and later rendered via dangerouslySetInnerHTML in the Omnichannel Queue side panel (InquireSidePanelItem.tsx), injecting a real, clickable HTML link - pointing to any attacker-controlled domain, with arbitrary social-engineering text - into the DOM of any agent viewing the queue. Added CWE CWE-79 Added Reference https://github.com/RocketChat/Rocket.Chat/pull/41595 Added Reference https://hackerone.com/reports/3872858