How severe is CVE-2020-16266?

CVE-2020-16266 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-2020-16266 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-16266?

CVE-2020-16266 affects Mantisbt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-16266?

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

When was CVE-2020-16266 published?

CVE-2020-16266 was published on 2020-08-12 and last updated on 2026-06-17.

CVE-2020-16266

CVE-2020-16266 is a medium-severity vulnerability in Mantisbt 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% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mantisbt
Published: 2020-08-12
Last modified: 2026-06-17

Description

An XSS issue was discovered in MantisBT before 2.24.2. Improper escaping on view_all_bug_page.php allows a remote attacker to inject arbitrary HTML into the page by saving it into a text Custom Field, leading to possible code execution in the browser of any user subsequently viewing the issue (if CSP settings allow it).

Frequently asked questions

What is CVE-2020-16266?: An XSS issue was discovered in MantisBT before 2.24.2. Improper escaping on view_all_bug_page.php allows a remote attacker to inject arbitrary HTML into the page by saving it into a text Custom Field, leading to possible code execution in the browser of any user subsequently viewing the issue (if CSP settings allow it).
How severe is CVE-2020-16266?: CVE-2020-16266 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-2020-16266 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-16266?: CVE-2020-16266 affects Mantisbt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-16266?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-16266 published?: CVE-2020-16266 was published on 2020-08-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mantisbt:mantisbt:*:*:*:*:*:*:*:*

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