How severe is GHSA-j3gg-r6gp-95q2?

No CVSS score has been assigned to GHSA-j3gg-r6gp-95q2 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-j3gg-r6gp-95q2?

GHSA-j3gg-r6gp-95q2 affects the following packages: phoenix_html (Hex). Ecosystems affected: Hex.

How do I fix GHSA-j3gg-r6gp-95q2?

Update phoenix_html to 3.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j3gg-r6gp-95q2 is resolved across your whole dependency graph.

How do I detect GHSA-j3gg-r6gp-95q2 in my Hex dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phoenix_html. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-j3gg-r6gp-95q2 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-j3gg-r6gp-95q2?

O3 pinpoints whether GHSA-j3gg-r6gp-95q2 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-j3gg-r6gp-95q2 actively exploited in the wild?

No public exploit code has been indexed for GHSA-j3gg-r6gp-95q2 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.

When was GHSA-j3gg-r6gp-95q2 published, and has it been updated?

GHSA-j3gg-r6gp-95q2 was published on April 12, 2022 and was last updated on July 8, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💧 Hex

GHSA-j3gg-r6gp-95q2

GHSA-j3gg-r6gp-95q2 is a security vulnerability in phoenix_html. O3 Security confirms whether GHSA-j3gg-r6gp-95q2 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

XSS in HEEx class attributes

Published

Apr 12, 2022

Updated

Jul 8, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Blast Radius

1 pkg affected

💧phoenix_html

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Hex packages — download data is not available via public APIs for these ecosystems.

Description

The class attribute was not protected against XSS attacks when using HEEx.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
💧Hex	`phoenix_html`	all versions	3.0.4

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phoenix_html. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update phoenix_html to 3.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j3gg-r6gp-95q2 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 pinpoints whether GHSA-j3gg-r6gp-95q2 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-j3gg-r6gp-95q2. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

The `class` attribute was not protected against XSS attacks when using HEEx.

O3 Security · Impact-Aware SCA

Is GHSA-j3gg-r6gp-95q2 in your dependencies?

O3 detects GHSA-j3gg-r6gp-95q2 across Hex dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works