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Fencer Vulns
high 7.1

CVE-2024-28199 json

Cross-site Scripting (XSS) possible with maliciously formed HTML attribute names and values in Phlex

published 2024-03-11 2 y ago modified 2026-09-10 1 mo ago also GHSA-242p-4v39-2v8g , EUVD-2024-0782

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

phlex is an open source framework for building object-oriented views in Ruby. There is a potential cross-site scripting (XSS) vulnerability that can be exploited via maliciously crafted user data. This was due to improper case-sensitivity in the code that was meant to prevent these attacks. If you render an `<a>` tag with an `href` attribute set to a user-provided link, that link could potentially execute JavaScript when clicked by another user. If you splat user-provided attributes when rendering any HTML tag, malicious event attributes could be included in the output, executing JavaScript when the events are triggered by another user. Patches are available on RubyGems for all 1.x minor versions. Users are advised to upgrade. Users unable to upgrade should consider configuring a content security policy that does not allow `unsafe-inline`.

Patch / fix

  • rubygems phlex 1.0.1, 1.1.1, 1.2.2, 1.3.3, 1.4.1, 1.5.2, 1.6.2, 1.7.1, 1.8.2, 1.9.1
  • phlex phlex 1.0.1, 1.2.2, 1.3.3

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
rubygems phlex
>=1.9.0, <1.9.1
>=1.8.0, <1.8.2
>=1.7.0, <1.7.1
>=1.6.0, <1.6.2
>=1.5.0, <1.5.2
>=1.4.0, <1.4.1
>=1.3.0, <1.3.3
>=1.2.0, <1.2.2
>=1.1.0, <1.1.1
<1.0.1
1.9.1
1.8.2
1.7.1
1.6.2
1.5.2
1.4.1
1.3.3
1.2.2
1.1.1
1.0.1

Affected products

  • phlex-ruby phlex

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.