CVE-2021-46871 phoenix_html allows Cross-site Scripting in HEEx class attributes
Cross-site scripting vulnerability in Phoenix.HTML allows attackers to inject malicious scripts via HEEx class attributes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-46871?
CVE-2021-46871 is a medium-severity cross-site scripting vulnerability in n/a, published on 10 Jan 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
tag.ex in Phoenix Phoenix.HTML (aka phoenix_html) before 3.0.4 allows XSS in HEEx class attributes.
Weakness: CWE-79
Which versions are affected by CVE-2021-46871?
6 open source packages ship an affected version, including phoenix_html. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
phoenix_html Hex | All versions | 3.0.4 |
phoenix_html Hex | All versions | 3.0.4 |
phoenix_html Hex | All versions | 3.0.4 |
phoenix_html Hex | All versions | 3.0.4 |
phoenix_html npm | All versions | 3.0.4 |
phoenix_html npm | All versions | 3.0.4 |
Products include Phoenixframework Phoenix Html.
How do I fix CVE-2021-46871?
Upgrade phoenix_html to 3.0.4 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-46871 being exploited?
There is no known exploitation of CVE-2021-46871 in the wild and no public exploit code.
Sources
Also known as GHSA-5g2h-9x5v-5h3x, GHSA-j3gg-r6gp-95q2.