LinkedIn Oncall vulnerable to Cross-Site Scripting

published 2021-02-05 5 y ago modified 2026-06-17 4 mo ago also GHSA-rfw2-x9f8-2f6m , PYSEC-2021-33 , EUVD-2021-0159

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.2%; EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

pypi oncall 1.4.1

github.com/linkedin/oncall@843bc10 commit

Exploit prediction

3.20% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/linkedin/oncall/issues/341 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	oncall	<1.4.1	1.4.1

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /linkedin/oncall/commit/843bc106a1c1b1699e9e52b6b0d01c7efe1d6225
web
github.com /linkedin/oncall/issues/341
web, exploit, issue-tracking, third-party-advisory, report
nvd.nist.gov /vuln/detail/CVE-2021-26722
advisory
github.com /advisories/GHSA-rfw2-x9f8-2f6m
advisory
github.com /linkedin/oncall
package
github.com /pypa/advisory-database/tree/main/vulns/oncall/PYSEC-2021-33.yaml
web
pypi.org /project/oncall
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary