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CVE-2026-91159— Discourse: Stored oEmbed HTML injection via allowed iframe

一分钟漏洞结论

影响对象
discourse discourse
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, oEmbed processing treated an entire attacker-controlled HTML fragment as trusted when the fragment contained an iframe whose source matched the configured all

CVSS 7.7 · High

影响版本矩阵 4

厂商产品 版本范围状态
discourse discourse < 2026.1.9 affected
>= 2026.7.0-latest, < 2026.7.3 affected
>= 2026.8.0-latest, < 2026.8.1 affected
>= 2026.9.0-latest, < 2026.9.0 affected
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一、 漏洞 CVE-2026-91159 基础信息

漏洞信息

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Vulnerability Title
Discourse: Stored oEmbed HTML injection via allowed iframe
来源: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, oEmbed processing treated an entire attacker-controlled HTML fragment as trusted when the fragment contained an iframe whose source matched the configured allowlist. A user with posting permission who controlled a public webpage and its oEmbed response could combine an allowlisted iframe with unrelated sibling HTML or CSS, causing stored visual overlays or other styled content to appear in post content and enabling misleading or fraudulent user interfaces. Exploitation requires a posting account, control of the fetched webpage and oEmbed response, and an allowlisted iframe source. The issue affects content integrity but does not expose restricted data, disrupt availability, or require interaction with Discourse Content Security Policy. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
来源: 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)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
discourse discourse < 2026.1.9 -

二、漏洞 CVE-2026-91159 的公开POC

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三、漏洞 CVE-2026-91159 的情报信息

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CVE-2026-91159 补丁与修复 (4)

CVE-2026-91159 其他参考 (1)

同批安全公告 · discourse · 2026-10-14 · 共 3 条

CVE-2026-91156 7.5 HIGH Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users
CVE-2026-91157 7.5 HIGH Discourse: Media uploads remain publicly accessible after category permissions are restric

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-91159

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