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CVE-2021-46871

21
FAUCET Score

CVE-2021-46871 describes a Cross-Site Scripting (XSS) vulnerability in the tag.ex component of Phoenix.HTML (phoenix_html) versions prior to 3.0.4, affecting the Phoenix Framework. This medium-severity vulnerability (CVSS 6.1) can be exploited remotely with low attack complexity, requiring user interaction, and could lead to limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.0.4CPE matchmatch criteria
cpe:2.3:a:phoenixframework:phoenix_html:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
34.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 36th percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

erlangpatch availablevia ghsa
Product: phoenix_htmlFixed in: 3.0.4
github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: phoenix_htmlFixed in: 3.0.4

Vendor Advisories (1)

npmGHSA-5g2h-9x5v-5h3xmedium

phoenix_html allows Cross-site Scripting in HEEx class attributes

Jan 10, 2023

References

github.com / advisories/GHSA-j3gg-r6gp-95q2
PatchThird Party Advisory
github.com / phoenixframework/phoenix_html/commit/62a0139fb716bcdce697f6221244bd81d321d620
PatchThird Party Advisory