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VulnerabilityPublished Updated

CVE-2026-42615: CyberChef has a Cross-site Scripting issue

Affects cyberchefSource GCVE Database

0
Authoritative record:CVE-2026-42615· High 7.2

Not known to be exploited · CVSS 7.2 High : upgrade to 11.0.0 soon.

Data as of 27 Oct 2026, 00:07 UTC

CVSS 3.1 base score
7.2High
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
npmcyberchefAffected
  • <11.0.0
Fixed in
  • 11.0.0

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

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