How severe is CVE-2021-20829?

CVE-2021-20829 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-20829 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20829?

CVE-2021-20829 affects Weseek Growi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20829?

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

When was CVE-2021-20829 published?

CVE-2021-20829 was published on 2021-09-21 and last updated on 2026-06-17.

CVE-2021-20829

CVE-2021-20829 is a medium-severity vulnerability in Weseek Growi with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Weseek Growi
Published: 2021-09-21
Last modified: 2026-06-17

Description

Cross-site scripting vulnerability due to the inadequate tag sanitization in GROWI versions v4.2.19 and earlier allows remote attackers to execute an arbitrary script on the web browser of the user who accesses a specially crafted page.

Frequently asked questions

What is CVE-2021-20829?: Cross-site scripting vulnerability due to the inadequate tag sanitization in GROWI versions v4.2.19 and earlier allows remote attackers to execute an arbitrary script on the web browser of the user who accesses a specially crafted page.
How severe is CVE-2021-20829?: CVE-2021-20829 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-20829 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20829?: CVE-2021-20829 affects Weseek Growi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20829?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20829 published?: CVE-2021-20829 was published on 2021-09-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:weseek:growi:*:*:*:*:*:*:*:*

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