How severe is CVE-2026-46580?

No CVSS score has been assigned to CVE-2026-46580 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-46580?

CVE-2026-46580 affects the following packages: @theia/ai-chat-ui (npm), @theia/ai-chat (npm), @theia/ai-claude-code (npm), @theia/ai-code-completion (npm), @theia/ai-core (npm), @theia/ai-editor (npm). Ecosystems affected: npm.

How do I fix CVE-2026-46580?

Update @theia/ai-chat-ui to 1.71.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-46580 is resolved across your whole dependency graph.

How do I detect CVE-2026-46580 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @theia/ai-chat-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-46580 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2026-46580 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-46580 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-46580?

CVE-2026-46580 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 44th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-46580?

CVE-2026-46580 is classified as CWE-829 (CWE-829). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-46580 published, and has it been updated?

CVE-2026-46580 was published on June 18, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2026-46580: @theia/ai-chat-ui

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-46580.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

6 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

7other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

@theia/ai-chat-uinpm

11Kdownloads / week

@theia/ai-chatnpm

11Kdownloads / week

@theia/ai-claude-codenpm

4Kdownloads / week

Description

In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious repository containing prompt template files that, when the workspace was opened in Theia, replaced the AI's system instructions with attacker-controlled content (indirect prompt injection). Combined with other AI chat features available in untrusted workspaces, this enabled attack chains leading to data exfiltration via Markdown image rendering or arbitrary command execution via task definitions.

Affected Packages

6 total 6 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@theia/ai-chat-ui`	all versions	1.71.0`npm install @theia/ai-chat-ui@1.71.0`
📦npm	`@theia/ai-chat`	all versions	1.71.0`npm install @theia/ai-chat@1.71.0`
📦npm	`@theia/ai-claude-code`	all versions	1.71.0`npm install @theia/ai-claude-code@1.71.0`
📦npm	`@theia/ai-code-completion`	all versions	1.71.0`npm install @theia/ai-code-completion@1.71.0`
📦npm	`@theia/ai-core`	all versions	1.71.0`npm install @theia/ai-core@1.71.0`
📦npm	`@theia/ai-editor`	all versions	1.71.0`npm install @theia/ai-editor@1.71.0`

Affected Products

1 product · 1 configurations

Application

theiaeclipse

< 1.71.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @theia/ai-chat-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @theia/ai-chat-ui to 1.71.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-46580 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious repository containing prompt template files that, when the workspace was opened in Theia, replaced the AI's system instructions with attacker-controlled content (indirect prompt injection). Combined with other AI chat features available in untrusted workspaces, this enabled attack chains leading to data exfiltration via Markdown image rendering or arbitrary command

O3 Security · Impact-Aware SCA

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CVE-2026-46580 — @theia/ai-chat-ui