How severe is CVE-2021-29271?

CVE-2021-29271 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-2021-29271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29271?

CVE-2021-29271 affects Remark42. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29271?

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

When was CVE-2021-29271 published?

CVE-2021-29271 was published on 2021-03-27 and last updated on 2026-06-17.

CVE-2021-29271

CVE-2021-29271 is a medium-severity vulnerability in Remark42 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% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Remark42
Published: 2021-03-27
Last modified: 2026-06-17

Description

remark42 before 1.6.1 allows XSS, as demonstrated by "Locator: Locator{URL:" followed by an XSS payload. This is related to backend/app/store/comment.go and backend/app/store/service/service.go.

Frequently asked questions

What is CVE-2021-29271?: remark42 before 1.6.1 allows XSS, as demonstrated by "Locator: Locator{URL:" followed by an XSS payload. This is related to backend/app/store/comment.go and backend/app/store/service/service.go.
How severe is CVE-2021-29271?: CVE-2021-29271 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-2021-29271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29271?: CVE-2021-29271 affects Remark42. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29271 published?: CVE-2021-29271 was published on 2021-03-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:remark42:remark42:*:*:*:*:*:*:*:*

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CVE-2023-45966 — High (CVSS 7.5): umputun remark42 version 1.12.1 and before has a Blind Server-Side Request Forgery (SSRF) vulnerability.

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