What is CVE-2021-26722?

CVE-2021-26722 is a medium-severity vulnerability in Linkedin Oncall, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-02-05.

How severe is CVE-2021-26722?

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

Is CVE-2021-26722 known to be exploited?

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

XSS in Linkedin Oncall

CVE-2021-26722

LinkedIn Oncall through 1.4.0 allows reflected XSS via /query because of mishandling of the "No results found for" message in the search bar.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-02-05 · 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: 0.032 (87.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000

Affected products

Linkedin Oncall

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/linkedin/oncall/issues/341 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-26722?: CVE-2021-26722 is a medium-severity vulnerability in Linkedin Oncall, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-02-05.
How severe is CVE-2021-26722?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-26722 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.