How severe is CVE-2021-30151?

CVE-2021-30151 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-2021-30151 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30151?

CVE-2021-30151 primarily affects Contribsys Sidekiq. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-30151?

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

When was CVE-2021-30151 published?

CVE-2021-30151 was published on 2021-04-06 and last updated on 2026-06-17.

CVE-2021-30151

CVE-2021-30151 is a medium-severity vulnerability in Contribsys Sidekiq 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: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Contribsys Sidekiq
Published: 2021-04-06
Last modified: 2026-06-17

Description

Sidekiq through 5.1.3 and 6.x through 6.2.0 allows XSS via the queue name of the live-poll feature when Internet Explorer is used.

Frequently asked questions

What is CVE-2021-30151?: Sidekiq through 5.1.3 and 6.x through 6.2.0 allows XSS via the queue name of the live-poll feature when Internet Explorer is used.
How severe is CVE-2021-30151?: CVE-2021-30151 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-2021-30151 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30151?: CVE-2021-30151 primarily affects Contribsys Sidekiq. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-30151?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-30151 published?: CVE-2021-30151 was published on 2021-04-06 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:contribsys:sidekiq:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

More vulnerabilities in Contribsys Sidekiq

CVE-2023-1892 — Critical (CVSS 9.6): Cross-site Scripting (XSS) - Reflected in GitHub repository sidekiq/sidekiq prior to 7.0.8.
CVE-2023-26141 — High (CVSS 7.5): Versions of the package sidekiq before 7.1.3 are vulnerable to Denial of Service (DoS) due to insufficient checks in…
CVE-2022-23837 — High (CVSS 7.5): In api.rb in Sidekiq before 5.2.10 and 6.4.0, there is no limit on the number of days when requesting stats for the…
CVE-2023-46951 — Medium (CVSS 6.1): Cross Site Scripting vulnerability in Contribsys Sidekiq v.6.5.8 allows a remote attacker to obtain sensitive…
CVE-2023-46950 — Medium (CVSS 6.1): Cross Site Scripting vulnerability in Contribsys Sidekiq v.6.5.8 allows a remote attacker to obtain sensitive…

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