How severe is CVE-2022-21169?

CVE-2022-21169 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2022-21169 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-21169?

CVE-2022-21169 affects Express Xss Sanitizer Project Express Xss Sanitizer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-21169?

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

When was CVE-2022-21169 published?

CVE-2022-21169 was published on 2022-09-26 and last updated on 2026-06-17.

CVE-2022-21169

CVE-2022-21169 is a high-severity vulnerability in Express Xss Sanitizer Project Express Xss Sanitizer with a CVSS 3.x base score of 7.3. 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-1321.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Express Xss Sanitizer Project Express Xss Sanitizer
Published: 2022-09-26
Last modified: 2026-06-17

Description

The package express-xss-sanitizer before 1.1.3 are vulnerable to Prototype Pollution via the allowedTags attribute, allowing the attacker to bypass xss sanitization.

Frequently asked questions

What is CVE-2022-21169?: The package express-xss-sanitizer before 1.1.3 are vulnerable to Prototype Pollution via the allowedTags attribute, allowing the attacker to bypass xss sanitization.
How severe is CVE-2022-21169?: CVE-2022-21169 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2022-21169 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-21169?: CVE-2022-21169 affects Express Xss Sanitizer Project Express Xss Sanitizer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-21169?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-21169 published?: CVE-2022-21169 was published on 2022-09-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:express_xss_sanitizer_project:express_xss_sanitizer:*:*:*:*:*:node.js:*:*

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