CVE-2026-42615: CyberChef has a Cross-site Scripting issue
Affects cyberchefSource GCVE Database
Not known to be exploited · CVSS 7.2 High : upgrade to 11.0.0 soon.
Data as of 27 Oct 2026, 00:07 UTC
- Patch
- Available – fixed in 11.0.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 29 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade cyberchef to 11.0.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| npmcyberchef | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
References
- nvd.nist.gov/vuln/detail/CVE-2026-42615 (opens in a new tab)
- github.com/gchq/CyberChef/issues/2344 (opens in a new tab)
- github.com/gchq/CyberChef/pull/2346 (opens in a new tab)
- github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d (opens in a new tab)
- github.com/gchq/CyberChef (opens in a new tab)
- github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0 (opens in a new tab)