CVE-2026-28509

5.4 mediumEPSS 0.2%

Medium (5.4) in langbot langbot. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-03-06
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

langbot:langbot

References

https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866
https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h

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