How severe is CVE-2021-43633?

CVE-2021-43633 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-2021-43633 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43633?

CVE-2021-43633 affects Messaging Web Application Project Messaging Web Application. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43633?

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

When was CVE-2021-43633 published?

CVE-2021-43633 was published on 2022-04-14 and last updated on 2026-06-17.

CVE-2021-43633

CVE-2021-43633 is a medium-severity vulnerability in Messaging Web Application Project Messaging Web Application 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: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Messaging Web Application Project Messaging Web Application
Published: 2022-04-14
Last modified: 2026-06-17

Description

Sourcecodester Messaging Web Application 1.0 is vulnerable to stored XSS. If a sender inserts valid scripts into the chat, the script will be executed on the receiver chat.

Frequently asked questions

What is CVE-2021-43633?: Sourcecodester Messaging Web Application 1.0 is vulnerable to stored XSS. If a sender inserts valid scripts into the chat, the script will be executed on the receiver chat.
How severe is CVE-2021-43633?: CVE-2021-43633 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-2021-43633 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43633?: CVE-2021-43633 affects Messaging Web Application Project Messaging Web Application. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43633?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43633 published?: CVE-2021-43633 was published on 2022-04-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:messaging_web_application_project:messaging_web_application:1.0:*:*:*:*:*:*:*

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