CVE-2023-42808Public exploitNetwork attack vector

Reflected XSS via traversable locale path

Published Oct 4, 2023 · Updated Sep 19, 2024

Reflected XSS in Mozilla Common Voice 1.88.2 and earlier allows remote attackers to run same-origin script via a crafted locale URL. The privacy route passes its locale parameter to fetchLegalDocument, which permits ../ traversal to attacker-controlled Markdown and renders it as HTML. A victim must open the crafted URL; the resulting script executes with the Common Voice server origin and can access origin-scoped data.

CVSS severity6.1
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Mozilla Common Voice 1.88.2 and earlier allows remote attackers to run same-origin script via a crafted locale URL. The privacy route passes its locale parameter to fetchLegalDocument, which permits ../ traversal to attacker-controlled Markdown and renders it as HTML. A victim must open the crafted URL; the resulting script executes with the Common Voice server origin and can access origin-scoped data.

The record

CVE
CVE-2023-42808
Published
Oct 4, 2023
Updated
Sep 19, 2024
Vendor
Mozilla
Product
Common Voice
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.88.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Common Voiceversion=<= 1.88.2

Published CVSS scores

6.1GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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