CVE-2026-28509
LangBot has a Cross Site Scripting(XSS) Vulnerability
Description
LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.
INFO
Published Date :
March 6, 2026, 5:16 a.m.
Last Modified :
March 16, 2026, 1:35 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update LangBot to version 4.8.7 or later.
- Review rehypeRaw configuration for security.
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-2026-28509.
| URL | Resource |
|---|---|
| https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866 | Patch |
| https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-28509 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-2026-28509
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-2026-28509 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-28509 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]
Mar. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:langbot:langbot:*:*:*:*:*:*:*:* versions up to (excluding) 4.8.7 Added Reference Type GitHub, Inc.: https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Mar. 06, 2026
Action Type Old Value New Value Added Description LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N Added CWE CWE-79 Added Reference https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866 Added Reference https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h