CVE-2021-34657Network attack vector

Reflected script execution via unsanitized text input

Published Aug 16, 2021 · Updated May 5, 2025

Reflected XSS in TypoFR 0.11 and earlier allows remote attackers to run arbitrary script in a visitor's browser via crafted text input. The text function in vendor/Org_Heigl/Hyphenator/index.php places attacker-controlled text into its HTTP response without neutralizing script markup. Exploitation requires a visitor to follow an attacker-crafted request, after which the script runs in the site's origin and can read or modify browser-accessible data.

CVSS severity6.1
Medium
EPSS probability0.84%
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 TypoFR 0.11 and earlier allows remote attackers to run arbitrary script in a visitor's browser via crafted text input. The text function in vendor/Org_Heigl/Hyphenator/index.php places attacker-controlled text into its HTTP response without neutralizing script markup. Exploitation requires a visitor to follow an attacker-crafted request, after which the script runs in the site's origin and can read or modify browser-accessible data.

The record

CVE
CVE-2021-34657
Published
Aug 16, 2021
Updated
May 5, 2025
Vendor
TypoFR
Product
TypoFR
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 2021CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record 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=0.11 <=0.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TypoFR · TypoFRversion=0.11 <=0.11

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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