CVE-2021-46781Public exploitNetwork attack vector

Reflected script execution via unescaped tab attribute

Published Apr 25, 2022 · Updated Aug 4, 2024

Reflected XSS in Coming Soon by Supsystic before 1.7.6 allows remote attackers to execute script via a crafted admin-page URL. The admin dashboard inserts the unsanitized tab parameter into an HTML attribute without context-appropriate escaping. A logged-in administrator must open the crafted URL; the script then runs in that administrator's browser context.

CVSS severity6.1
Medium
EPSS probability0.80%
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 Coming Soon by Supsystic before 1.7.6 allows remote attackers to execute script via a crafted admin-page URL. The admin dashboard inserts the unsanitized tab parameter into an HTML attribute without context-appropriate escaping. A logged-in administrator must open the crafted URL; the script then runs in that administrator's browser context.

The record

CVE
CVE-2021-46781
Published
Apr 25, 2022
Updated
Aug 4, 2024
Vendor
Supsystic
Product
Coming Soon by Supsystic
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=1.7.6 <1.7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Supsystic · Coming Soon by Supsysticversion=1.7.6 <1.7.6

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS: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.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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