How severe is CVE-2021-40887?

CVE-2021-40887 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40887 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40887?

CVE-2021-40887 affects Projectsend. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40887?

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-2021-40887 published?

CVE-2021-40887 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-40887

CVE-2021-40887 is a critical-severity vulnerability in Projectsend with a CVSS 3.x base score of 9.8. 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Projectsend
Published: 2021-10-11
Last modified: 2026-06-17

Description

Projectsend version r1295 is affected by a directory traversal vulnerability. Because of lacking sanitization input for files[] parameter, an attacker can add ../ to move all PHP files or any file on the system that has permissions to /upload/files/ folder.

Frequently asked questions

What is CVE-2021-40887?: Projectsend version r1295 is affected by a directory traversal vulnerability. Because of lacking sanitization input for files[] parameter, an attacker can add ../ to move all PHP files or any file on the system that has permissions to /upload/files/ folder.
How severe is CVE-2021-40887?: CVE-2021-40887 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40887 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40887?: CVE-2021-40887 affects Projectsend. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40887?: 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-2021-40887 published?: CVE-2021-40887 was published on 2021-10-11 and last updated on 2026-06-17.

References

https://github.com/projectsend/projectsend/issues/994

Affected products (1)

cpe:2.3:a:projectsend:projectsend:r1295:*:*:*:*:*:*:*

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