CVE-2026-42615 json
CyberChef has a Cross-site Scripting issue
published 2026-04-29 6 mo ago modified 2026-07-24 3 mo ago also GHSA-h4hv-92pp-pcjg , EUVD-2026-26191
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
Summary
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
Patch / fix
- npm cyberchef 11.0.0
- GCHQ CyberChef 11.0.0
- github.com/gchq/CyberChef@9641ae0 commit
- github.com/gchq/CyberChef#2346 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | cyberchef | <11.0.0 |
11.0.0 |
Affected products
- GCHQ CyberChef
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d
web
-
github.com
/gchq/CyberChef/pull/2346
web
-
github.com
/gchq/CyberChef/issues/2344
web
-
github.com
/gchq/CyberChef/compare/v10.24.0...v11.0.0
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-42615
advisory
-
github.com
/gchq/CyberChef
package
Sources
- CVE List CVE-2026-42615
- GitHub Advisory GHSA-h4hv-92pp-pcjg
- NVD CVE-2026-42615
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.