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CVE-2026-49264— OAuthLib: Unsafe JSONP callback injection in RevocationEndpoint allows arbitrary JavaScript response generation

Quick assessment

Affected
oauthlib oauthlib
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.

OAuthLib 是用于 Python 3.6+ 的 OAuth 请求签名逻辑的实现。在版本 0.6.1 至 4.0.0 之间，OAuthLib 的 （位于 ）在启用 时，会将未经验证的回调请求参数直接反射到成功和错误响应体中。该回调参数可来源于查询字符串或请求正文，并且在使用时未对其限制为合法的 JavaScript 函数名。因此，若浏览器应用程序将撤销响应作为可信的 JSONP 加载，并允许攻击者控制回调名称，则可能在该应用所属源上下文中执行由攻击者控制的 JavaScript 代码，从而访问其 DOM 和可通

CVSS 6.1 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
oauthlib oauthlib >= 0.6.1, < 4.0.0 affected
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I. Basic Information for CVE-2026-49264

Vulnerability Information
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Vulnerability Title
OAuthLib: Unsafe JSONP callback injection in RevocationEndpoint allows arbitrary JavaScript response generation
Source: CVE Program / CVE List V5
Vulnerability Description
OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 0.6.1 until 4.0.0, OAuthLib's RevocationEndpoint in oauthlib/oauth2/rfc6749/endpoints/revocation.py reflects an unvalidated callback request parameter into success and error response bodies when enable_jsonp=True. The callback can come from the query string or request body and is used without restricting it to a legal JavaScript function name. A browser application that loads the revocation response as trusted JSONP and permits attacker influence over callback can therefore execute attacker-controlled JavaScript in the including application's origin, with access to its DOM and script-accessible data. The feature is disabled by default, so only deployments that explicitly enable JSONP are affected. This issue is fixed in version 4.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
oauthlib oauthlib >= 0.6.1, < 4.0.0 -

II. Public POCs for CVE-2026-49264

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III. Intelligence Information for CVE-2026-49264

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Patches & Fixes for CVE-2026-49264 (1)

Vendor Advisories for CVE-2026-49264 (1)

Other References for CVE-2026-49264 (1)

IV. Related Vulnerabilities

Same product: oauthlib
Same vendor: oauthlib
Same weakness: CWE-79

V. Comments for CVE-2026-49264

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