CVE-2026-42401 json
Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection
published 5mo ago modified 26d ago also BIT-elk-2026-42401 , BIT-kibana-2026-42401 , EUVD-2026-33012
- cvss
- 4.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
Improper Neutralization of Input During Web Page Generation (CWE-79) in Kibana can lead to stored HTML injection. A user with write access to an Elasticsearch index could persist crafted markup which, when subsequently rendered through an affected Kibana view by another user, was not sufficiently sanitized. Successful exploitation could result in unauthorized UI manipulation and outbound network requests issued from the viewing user's browser session.
Patch / fix
- bitnami elk 8.19.16, 9.3.5
- bitnami kibana 8.19.16, 9.3.5
- elastic kibana 8.19.16, 9.3.5
- elasticsearch kibana 8.19.16, 9.3.5
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/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 |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | elk | >=8.0.0, <8.19.16 >=9.0.0, <9.3.5 |
8.19.16 9.3.5 |
| bitnami | kibana | >=8.0.0, <8.19.16 >=9.0.0, <9.3.5 |
8.19.16 9.3.5 |
Affected products
- Elastic Kibana
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
discuss.elastic.co
/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552
vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-42401
web
Sources
- CVE List CVE-2026-42401
- NVD CVE-2026-42401
- OSV BIT-elk-2026-42401
- OSV BIT-kibana-2026-42401
Fencer Intel 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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.