How severe is CVE-2021-27370?

CVE-2021-27370 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-2021-27370 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27370?

CVE-2021-27370 affects Monicahq Monica. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27370?

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

When was CVE-2021-27370 published?

CVE-2021-27370 was published on 2021-02-22 and last updated on 2026-06-17.

CVE-2021-27370

CVE-2021-27370 is a medium-severity vulnerability in Monicahq Monica 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: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Monicahq Monica
Published: 2021-02-22
Last modified: 2026-06-17

Description

The Contact page in Monica 2.19.1 allows stored XSS via the Last Name field.

Frequently asked questions

What is CVE-2021-27370?: The Contact page in Monica 2.19.1 allows stored XSS via the Last Name field.
How severe is CVE-2021-27370?: CVE-2021-27370 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-2021-27370 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27370?: CVE-2021-27370 affects Monicahq Monica. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27370?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27370 published?: CVE-2021-27370 was published on 2021-02-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:monicahq:monica:2.19.1:*:*:*:*:*:*:*

More vulnerabilities in Monicahq Monica

CVE-2026-26747 — Critical (CVSS 9.1): A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP Host header in…
CVE-2024-54996 — High (CVSS 8.8): MonicaHQ v4.1.2 was discovered to contain multiple authenticated Client-Side Injection vulnerabilities via the title…
CVE-2023-1094 — High (CVSS 8.8): MonicaHQ version 4.0.0 allows an authenticated remote attacker to execute malicious code in the application via CSTI in…
CVE-2023-1031 — High (CVSS 8.8): MonicaHQ version 4.0.0 allows an authenticated remote attacker to execute malicious code in the application via CSTI in…
CVE-2024-54999 — Medium (CVSS 6.5): MonicaHQ v4.1.2 was discovered to contain a Client-Side Injection vulnerability via the last_name parameter the General…
CVE-2024-54994 — Medium (CVSS 6.5): MonicaHQ v4.1.2 was discovered to contain multiple Client-Side Injection vulnerabilities via the first_name and…

All CVEs affecting Monicahq Monica →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →