CVE-2021-34642Network attack vector

Reflected XSS via unsanitized api_key output

Published Aug 16, 2021 · Updated May 5, 2025

Reflected XSS in Followistic Smart Email Alerts 1.0.10 and earlier allows remote attackers to inject scripts via the api_key parameter. The settings view reflects api_key input into the generated page without neutralizing executable web content. Exploitation requires a victim to follow a crafted request, after which the script runs in that victim's browser context and can read or alter page data.

CVSS severity6.1
Medium
EPSS probability0.94%
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 Followistic Smart Email Alerts 1.0.10 and earlier allows remote attackers to inject scripts via the api_key parameter. The settings view reflects api_key input into the generated page without neutralizing executable web content. Exploitation requires a victim to follow a crafted request, after which the script runs in that victim's browser context and can read or alter page data.

The record

CVE
CVE-2021-34642
Published
Aug 16, 2021
Updated
May 5, 2025
Vendor
Followistic
Product
Smart Email Alerts
Classifications
CWE-79, T1204.001
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=1.0.10 <=1.0.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Followistic · Smart Email Alertsversion=1.0.10 <=1.0.10

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1204.001User Execution: Malicious Link

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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