How severe is CVE-2021-41317?

CVE-2021-41317 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41317 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41317?

CVE-2021-41317 affects Xss Hunter Express Project Xss Hunter Express. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41317?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-41317 published?

CVE-2021-41317 was published on 2021-09-17 and last updated on 2026-06-17.

CVE-2021-41317

CVE-2021-41317 is a critical-severity vulnerability in Xss Hunter Express Project Xss Hunter Express with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Xss Hunter Express Project Xss Hunter Express
Published: 2021-09-17
Last modified: 2026-06-17

Description

XSS Hunter Express before 2021-09-17 does not properly enforce authentication requirements for paths.

Frequently asked questions

What is CVE-2021-41317?: XSS Hunter Express before 2021-09-17 does not properly enforce authentication requirements for paths.
How severe is CVE-2021-41317?: CVE-2021-41317 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41317 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41317?: CVE-2021-41317 affects Xss Hunter Express Project Xss Hunter Express. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41317?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-41317 published?: CVE-2021-41317 was published on 2021-09-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xss_hunter_express_project:xss_hunter_express:*:*:*:*:*:*:*:*

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CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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