How severe is GHSA-cvhv-6xm6-c3v4?

No CVSS score has been assigned to GHSA-cvhv-6xm6-c3v4 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-cvhv-6xm6-c3v4?

GHSA-cvhv-6xm6-c3v4 affects the following packages: agents (npm). Ecosystems affected: npm.

How do I fix GHSA-cvhv-6xm6-c3v4?

Update agents to 0.3.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cvhv-6xm6-c3v4 is resolved across your whole dependency graph.

How do I detect GHSA-cvhv-6xm6-c3v4 in my npm dependencies?

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

How do I mitigate GHSA-cvhv-6xm6-c3v4 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.

How does O3 Security protect against GHSA-cvhv-6xm6-c3v4?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-cvhv-6xm6-c3v4 can be triaged on real exposure rather than presence alone.

Is GHSA-cvhv-6xm6-c3v4 actively exploited in the wild?

No public exploit code has been indexed for GHSA-cvhv-6xm6-c3v4 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 GHSA-cvhv-6xm6-c3v4?

GHSA-cvhv-6xm6-c3v4 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 30th 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 GHSA-cvhv-6xm6-c3v4?

GHSA-cvhv-6xm6-c3v4 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-cvhv-6xm6-c3v4 published, and has it been updated?

GHSA-cvhv-6xm6-c3v4 was published on February 13, 2026 and was last updated on February 13, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

GHSA-cvhv-6xm6-c3v4 — agents

Fix: cloudflare/agents#841

GHSA-cvhv-6xm6-c3v4 is a Cross-site Scripting (XSS) vulnerability in agents. A fix is available for agents — see the affected versions and patch details below.

Cloudflare Agents is Vulnerable to Reflected Cross-Site Scripting in the AI Playground's OAuth callback handler

Also known asCVE-2026-1721

Published

Feb 13, 2026

Updated

Feb 13, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 24, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

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 GHSA-cvhv-6xm6-c3v4.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs30th percentile — riskier than 30% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg 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.

275other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

agentsnpm

1.2Mdownloads / week

Description

Summary

A Reflected Cross-Site Scripting (XSS) vulnerability was discovered in the AI Playground's OAuth callback handler. The error_description query parameter was directly interpolated into an HTML script tag without proper escaping, allowing attackers to execute arbitrary JavaScript in the context of the victim's session.

Root cause

The OAuth callback handler in site/ai-playground/src/server.ts directly interpolated the authError value, sourced from the error_description query parameter, into an inline <script> tag.

Impact

An attacker could craft a malicious link that, when clicked by a victim, would:

Steal user chat message history - Access all LLM interactions stored in the user's session.
Access connected MCP Servers - Interact with any MCP servers connected to the victim's session (public or authenticated/private), potentially allowing the attacker to perform actions on the victim's behalf

Mitigation:

PR: https://github.com/cloudflare/agents/pull/841 https://github.com/cloudflare/agents/pull/841
Agents-sdk users should upgrade to [email protected]
Developers using configureOAuthCallback with custom error handling in their own applications should ensure all user-controlled input is escaped before interpolation.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`agents`	all versions	0.3.10`npm install agents@0.3.10`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for agents, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update agents to 0.3.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cvhv-6xm6-c3v4 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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-cvhv-6xm6-c3v4 can be triaged on real exposure rather than presence alone.

Tailored to GHSA-cvhv-6xm6-c3v4. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Summary A Reflected Cross-Site Scripting (XSS) vulnerability was discovered in the AI Playground's OAuth callback handler. The `error_description` query parameter was directly interpolated into an HTML script tag without proper escaping, allowing attackers to execute arbitrary JavaScript in the context of the victim's session. Root cause The OAuth callback handler in `site/ai-playground/src/server.ts` directly interpolated the `authError` value, sourced from the `error_description` query parameter, into an inline `<script>` tag. Impact An attacker could craft a malicious link that, when

O3 Security · Impact-Aware SCA

Is GHSA-cvhv-6xm6-c3v4 in your dependencies?

O3 Security finds GHSA-cvhv-6xm6-c3v4 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works