CVE-2026-22028 is a medium-severity HTML injection vulnerability affecting Preact versions 10.26.5 through 10.26.9, 10.27.0 through 10.27.2, and 10.28.0 through 10.28.1. It arises from a regression that softens JSON serialization protection, allowing specially crafted JSON payloads to be misinterpreted as valid Virtual DOM nodes under specific conditions. This can lead to arbitrary script execution if not mitigated by a Content Security Policy. The CVSS score is 6.1 (MEDIUM), indicating a network-based attack requiring user interaction with low impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 10.26.5, < 10.26.10CPE matchmatch criteria | cpe:2.3:a:preactjs:preact:*:*:*:*:*:node.js:*:* | ||
>= 10.27.0, < 10.27.3CPE matchmatch criteria | cpe:2.3:a:preactjs:preact:*:*:*:*:*:node.js:*:* | ||
>= 10.28.0, < 10.28.2CPE matchmatch criteria | cpe:2.3:a:preactjs:preact:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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