How severe is CVE-2021-21260?

CVE-2021-21260 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2021-21260 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21260?

CVE-2021-21260 affects Bigprof Online Invoicing System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21260?

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

When was CVE-2021-21260 published?

CVE-2021-21260 was published on 2021-01-22 and last updated on 2026-06-17.

CVE-2021-21260

CVE-2021-21260 is a high-severity vulnerability in Bigprof Online Invoicing System with a CVSS 3.x base score of 7.6. 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: High (CVSS 3.x base score 7.6)
CVSS v2: 3.5
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Bigprof Online Invoicing System
Published: 2021-01-22
Last modified: 2026-06-17

Description

Online Invoicing System (OIS) is open source software which is a lean invoicing system for small businesses, consultants and freelancers created using AppGini. In OIS version 4.0 there is a stored XSS which can enables an attacker takeover of the admin account through a payload that extracts a csrf token and sends a request to change password. It has been found that Item description is reflected without sanitization in app/items_view.php which enables the malicious scenario.

Frequently asked questions

What is CVE-2021-21260?: Online Invoicing System (OIS) is open source software which is a lean invoicing system for small businesses, consultants and freelancers created using AppGini. In OIS version 4.0 there is a stored XSS which can enables an attacker takeover of the admin account through a payload that extracts a csrf token and sends a request to change password. It has been found that Item description is reflected without sanitization in app/items_view.php which enables the malicious scenario.
How severe is CVE-2021-21260?: CVE-2021-21260 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2021-21260 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21260?: CVE-2021-21260 affects Bigprof Online Invoicing System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21260?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-21260 published?: CVE-2021-21260 was published on 2021-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bigprof:online_invoicing_system:4.0:*:*:*:*:*:*:*

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