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CVE-2026-42615

31
FAUCET Score

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

First published: Apr 29, 2026Last modified: Apr 29, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 11.0.0CPE match
cpe:2.3:a:gchq:cyberchef:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.2HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.29%
Probability of exploitation in next 30 days
EPSS Percentile
21.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0029 is in the 5th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: cyberchefFixed in: 11.0.0

Vendor Advisories (1)

npmGHSA-h4hv-92pp-pcjghigh

CyberChef has a Cross-site Scripting issue

Apr 29, 2026

References

github.com / gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d
github.com / gchq/CyberChef/compare/v10.24.0...v11.0.0
github.com / gchq/CyberChef/issues/2344
github.com / gchq/CyberChef/pull/2346