How severe is CVE-2021-42940?

CVE-2021-42940 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42940?

CVE-2021-42940 affects Projeqtor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42940?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-42940 published?

CVE-2021-42940 was published on 2022-02-11 and last updated on 2026-06-17.

CVE-2021-42940

CVE-2021-42940 is a critical-severity vulnerability in Projeqtor with a CVSS 3.x base score of 9.9. 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: Critical (CVSS 3.x base score 9.9)
CVSS v2: 3.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Projeqtor
Published: 2022-02-11
Last modified: 2026-06-17

Description

A Cross Site Scripting (XSS) vulnerability exists in Projeqtor 9.3.1 via /projeqtor/tool/saveAttachment.php, which allows an attacker to upload a SVG file containing malicious JavaScript code.

Frequently asked questions

What is CVE-2021-42940?: A Cross Site Scripting (XSS) vulnerability exists in Projeqtor 9.3.1 via /projeqtor/tool/saveAttachment.php, which allows an attacker to upload a SVG file containing malicious JavaScript code.
How severe is CVE-2021-42940?: CVE-2021-42940 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42940?: CVE-2021-42940 affects Projeqtor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42940?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-42940 published?: CVE-2021-42940 was published on 2022-02-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:projeqtor:projeqtor:*:*:*:*:*:*:*:*

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