CVE-2026-22813
CVE-2026-22813 is a medium-severity vulnerability in Anoma Opencode with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v4: 9.4
- EPSS exploit prediction: 1% (56th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-2091
- Weakness: CWE-79
- Affected product: Anoma Opencode
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-22813?
- 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.
- How severe is CVE-2026-22813?
- CVE-2026-22813 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-22813 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-22813?
- CVE-2026-22813 affects Anoma Opencode. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-22813?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-22813 have an EU (EUVD) identifier?
- Yes. CVE-2026-22813 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2091.
- When was CVE-2026-22813 published?
- CVE-2026-22813 was published on 2026-01-12 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:anoma:opencode:*:*:*:*:*:-:*:*
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