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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-j3gg-r6gp-95q2 can be triaged on real exposure rather than presence alone.

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.

What is the EPSS score for GHSA-j3gg-r6gp-95q2?

GHSA-j3gg-r6gp-95q2 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 35th 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-j3gg-r6gp-95q2?

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

GHSA-j3gg-r6gp-95q2 was published on April 12, 2022 and was last updated on September 10, 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

Not in CISA KEV

GHSA-j3gg-r6gp-95q2 — phoenix_html

Fix: phoenixframework/phoenix_html@62a0139

GHSA-j3gg-r6gp-95q2 is a Cross-site Scripting (XSS) vulnerability in phoenix_html. A fix is available for phoenix_html — see the affected versions and patch details below.

XSS in HEEx class attributes

Also known asCVE-2021-46871 GHSA-5g2h-9x5v-5h3x

Published

Apr 12, 2022

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 18, 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-j3gg-r6gp-95q2.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs35th percentile — riskier than 35% 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.

3other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

phoenix_htmlHex

41Kdownloads / week

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`mix deps.update phoenix_html`

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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-j3gg-r6gp-95q2 can be triaged on real exposure rather than presence alone.

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 Security finds GHSA-j3gg-r6gp-95q2 across Hex 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