Host Header Injection in Splunk Enterprise

published 2022-11-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-46558

cvss: 3.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits: 0; none known

In Splunk Enterprise versions below 8.1.12, 8.2.9, and 9.0.2, Splunk Enterprise fails to properly validate and escape the Host header, which could let a remote authenticated user conduct various attacks against the system, including cross-site scripting and cache poisoning.

Patch / fix

fixed in 1

Splunk Splunk Enterprise 8.1.12, 8.2.9, 9.0.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-05-05)

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.0	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

Splunk Splunk Enterprise

Classification

Weakness

CWE-20 Improper Input Validation
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

splunk.com /en_us/product-security/announcements/svd-2022-1102.html
vendor-advisory

Sources

CVE List CVE-2022-43562
NVD CVE-2022-43562

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