8.8

CVE-2022-28284: mozilla firefox Improper Encoding or Escaping of Output

Modified
AliasesUBUNTU-CVE-2022-28284ALPINE-CVE-2022-28284
Published 22-12-2022Last modified 16-04-2025

Vulnerability summary

CVE-2022-28284 is a high (CVSS 8.8) Improper Encoding or Escaping of Output vulnerability in mozilla firefox. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 47.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.58%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2024:11975-1OPENSUSE-SU-2024:14572-1USN-5370-1

Timeline

  1. 22-12-2022
    PublishedVulnerability first disclosed.
  2. 16-04-2025
    Last modifiedVulnerability information updated.

Description

SVG's <code>&lt;use&gt;</code> element could have been used to load unexpected content that could have executed script in certain circumstances. While the specification seems to allow this, other browsers do not, and web developers relied on this property for script security so gecko's implementation was aligned with theirs. This vulnerability affects Firefox < 99.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 0.56% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine2 products
  • firefox< 99.0-r0
  • librewolf< 99.0-r0
Mozilla1 product
  • firefox≥ unspecified, < 99 | < 99.0
Ubuntu1 product
  • firefox< 99.0+build2-0ubuntu0.18.04.2 | < 99.0+build2-0ubuntu0.20.04.2 | < 1:1snap1-0ubuntu1

3 vendors · 4 products

References

7 links