What is CVE-2021-3853?

CVE-2021-3853 is a medium-severity vulnerability in Chaskiq, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-01-17.

How severe is CVE-2021-3853?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-3853 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Chaskiq

CVE-2021-3853

chaskiq is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-01-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (49.6th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Chaskiq
Chaskiq Chaskiq/chaskiq — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

b1nslashsh/CVE

References

huntr.dev/bounties/2b6a7647-8f2b-4510-b40f-c52aedc2820d (Exploit, Third Party Advisory)
github.com/chaskiq/chaskiq/commit/51768b21632dac89fd0dedb2b3b6d91bac732345 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3853?: CVE-2021-3853 is a medium-severity vulnerability in Chaskiq, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-01-17.
How severe is CVE-2021-3853?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-3853 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.