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CVE-2026-42794— Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug

Quick assessment

Affected
absinthe-graphql absinthe_plug
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Absinthe.Plug是Absinthe开源的一个用于Elixir的GraphQL工具包插件。 Absinthe.Plug 1.2.0版本存在跨站脚本漏洞，该漏洞源于GraphiQL接口中js_escape函数未转义反斜杠，可能导致反射型跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.28% · P21

Affected Version Matrix 2

VendorProduct Version RangeStatus
absinthe-graphql absinthe_plug 1.2.0< 1.5.10 affected
26241817cb4b9be4de3f5972c5fba3d36de3d713< 23a0d5658d32420086711adf4ce8f05febb09963 affected
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I. Basic Information for CVE-2026-42794

Vulnerability Information
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Vulnerability Title
Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface. 'Elixir.Absinthe.Plug.GraphiQL':js_escape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the query GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \'), breaking out of the string context and executing arbitrary JavaScript in the victim's browser. This issue affects absinthe_plug: from 1.2.0 before 1.5.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Absinthe.Plug 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Absinthe.Plug是Absinthe开源的一个用于Elixir的GraphQL工具包插件。 Absinthe.Plug 1.2.0版本存在跨站脚本漏洞，该漏洞源于GraphiQL接口中js_escape函数未转义反斜杠，可能导致反射型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
absinthe-graphql absinthe_plug 1.2.0 ~ 1.5.10 cpe:2.3:a:absinthe-graphql:absinthe_plug:*:*:*:*:*:*:*:*
absinthe-graphql absinthe_plug 26241817cb4b9be4de3f5972c5fba3d36de3d713 ~ 23a0d5658d32420086711adf4ce8f05febb09963 cpe:2.3:a:absinthe-graphql:absinthe_plug:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-42794

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III. Intelligence Information for CVE-2026-42794

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Patches & Fixes for CVE-2026-42794 (2)

Vendor Advisories for CVE-2026-42794 (2)

Same Patch Batch · absinthe-graphql · 2026-05-08 · 3 CVEs total

CVE-2026-42793 Atom table exhaustion via attacker-controlled GraphQL SDL names in absinthe
CVE-2026-43967 Quadratic fragment-name uniqueness check causes denial of service in absinthe

IV. Related Vulnerabilities

Same vendor: absinthe-graphql
Same weakness: CWE-79