How severe is CVE-2021-42664?

CVE-2021-42664 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-42664 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42664?

CVE-2021-42664 affects Engineers Online Portal Project Engineers Online Portal. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42664?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42664 published?

CVE-2021-42664 was published on 2021-11-05 and last updated on 2026-06-17.

CVE-2021-42664

CVE-2021-42664 is a medium-severity vulnerability in Engineers Online Portal Project Engineers Online Portal with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Engineers Online Portal Project Engineers Online Portal
Published: 2021-11-05
Last modified: 2026-06-17

Description

A Stored Cross Site Scripting (XSS) Vulneraibiilty exists in Sourcecodester Engineers Online Portal in PHP via the (1) Quiz title and (2) quiz description parameters to add_quiz.php. An attacker can leverage this vulnerability in order to run javascript commands on the web server surfers behalf, which can lead to cookie stealing and more.

Frequently asked questions

What is CVE-2021-42664?: A Stored Cross Site Scripting (XSS) Vulneraibiilty exists in Sourcecodester Engineers Online Portal in PHP via the (1) Quiz title and (2) quiz description parameters to add_quiz.php. An attacker can leverage this vulnerability in order to run javascript commands on the web server surfers behalf, which can lead to cookie stealing and more.
How severe is CVE-2021-42664?: CVE-2021-42664 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-42664 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42664?: CVE-2021-42664 affects Engineers Online Portal Project Engineers Online Portal. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42664?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42664 published?: CVE-2021-42664 was published on 2021-11-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:engineers_online_portal_project:engineers_online_portal:1.0:*:*:*:*:*:*:*

More vulnerabilities in Engineers Online Portal Project Engineers Online Portal

CVE-2021-42670 — Critical (CVSS 9.8): A SQL injection vulnerability exists in Sourcecodester Engineers Online Portal in PHP via the id parameter to the…
CVE-2021-42669 — Critical (CVSS 9.8): A file upload vulnerability exists in Sourcecodester Engineers Online Portal in PHP via dashboard_teacher.php, which…
CVE-2021-42668 — Critical (CVSS 9.8): A SQL Injection vulnerability exists in Sourcecodester Engineers Online Portal in PHP via the id parameter in the…
CVE-2021-42665 — Critical (CVSS 9.8): An SQL Injection vulnerability exists in Sourcecodester Engineers Online Portal in PHP via the login form inside of…
CVE-2021-43437 — High (CVSS 8.8): In sourcecodetester Engineers Online Portal as of 10-21-21, an attacker can manipulate the Host header as seen by the…
CVE-2021-42666 — High (CVSS 8.8): A SQL Injection vulnerability exists in Sourcecodester Engineers Online Portal in PHP via the id parameter to…

All CVEs affecting Engineers Online Portal Project Engineers Online Portal →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →