Popup
CVE-2021-24275
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue Affected products include: Supsystic Popup. Version information: before 1.10.5.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue
Threat Intelligence Overview
NVD
CVE.org
EPSS
Exploit-DB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
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An exploitable buffer overflow exists in the psnotifyd application of the Pharos PopUp printer client version 9.0. Rated
The Popup by Supsystic WordPress plugin before 1.10.19 has a prototype pollution vulnerability that could allow an attac
A buffer overflows exists in the psnotifyd application of the Pharos PopUp printer client version 9.0. Rated critical se
The ZYREX POPUP WordPress plugin through 1.0 does not validate the type of files uploaded when creating a popup, allowin
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in supsystic.Com Popup by S
Deserialization of Untrusted Data vulnerability in supsystic Popup by Supsystic popup-by-supsystic allows Command Inject
The Popup by Supsystic WordPress plugin before 1.10.9 does not have any authentication and authorisation in an AJAX acti
A denial of service vulnerability exists in the psnotifyd application of the Pharos PopUp printer client version 9.0. Ra
Missing Authorization vulnerability in supsystic Popup by Supsystic popup-by-supsystic allows Exploiting Incorrectly Con
Missing Authorization vulnerability in supsystic Popup by Supsystic popup-by-supsystic allows Exploiting Incorrectly Con
Missing Authorization vulnerability in supsystic Popup by Supsystic popup-by-supsystic.10.27. Rated medium severity (CVS
GitHub PoC