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Vulnerability details: VCID-6371-kaex-gybe
Vulnerability ID VCID-6371-kaex-gybe
Aliases CVE-2026-22813
GHSA-c83v-7274-4vgp
Summary OpenCode is an open source AI coding agent. The markdown renderer used for LLM responses will insert arbitrary HTML into the DOM. There is no sanitization with DOMPurify or even a CSP on the web interface to prevent JavaScript execution via HTML injection. This means controlling the LLM response for a chat session gets JavaScript execution on the http://localhost:4096 origin. This vulnerability is fixed in 1.1.10.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2026-22813
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-c83v-7274-4vgp
cvssv4 9.4 https://github.com/anomalyco/opencode
generic_textual CRITICAL https://github.com/anomalyco/opencode
cvssv3.1_qr CRITICAL https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
cvssv4 9.4 https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
generic_textual CRITICAL https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
ssvc Track* https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
cvssv4 9.4 https://nvd.nist.gov/vuln/detail/CVE-2026-22813
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2026-22813
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-22813
https://github.com/anomalyco/opencode
CVE-2026-22813 https://nvd.nist.gov/vuln/detail/CVE-2026-22813
GHSA-c83v-7274-4vgp https://github.com/advisories/GHSA-c83v-7274-4vgp
GHSA-c83v-7274-4vgp https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Found at https://github.com/anomalyco/opencode
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Found at https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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present

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Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-01-13T14:13:29Z/ Found at https://github.com/anomalyco/opencode/security/advisories/GHSA-c83v-7274-4vgp
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-22813
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

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low

none

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low

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none
Exploit Prediction Scoring System (EPSS)
Percentile 0.10847
EPSS Score 0.00035
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:52:49.243733+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/22xxx/CVE-2026-22813.json 38.6.0