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CVE-2026-45775— Discourse: Cross-site backup access via path traversal in multisite local backups

CVSS 6.8 · Medium EPSS 0.32% · P24

Possible ATT&CK Techniques 1AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProductVersion RangeStatus
discoursediscourse>= 2026.1.0-latest, < 2026.1.4affected
>= 2026.3.0-latest, < 2026.3.1affected
>= 2026.4.0-latest, < 2026.4.1affected
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I. Basic Information for CVE-2026-45775

Vulnerability Information
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Vulnerability Title
Discourse: Cross-site backup access via path traversal in multisite local backups
Source: NVD (National Vulnerability Database)
Vulnerability Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, a path traversal vulnerability in Discourse backup handling could allow an authenticated administrator on one site in a multisite deployment to access backup files belonging to another site when backups are stored locally. In affected configurations, an admin on Site A could potentially retrieve sensitive backup data from Site B (same host, multisite) by crafting a backup download request with a traversal payload. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Discourse 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse社区开源的一套开源的社区讨论平台。 该平台包括社区、电子邮件和聊天室等功能。 Discourse存在路径遍历漏洞，该漏洞源于备份处理存在路径遍历问题，可能导致经过身份验证的管理员在多站点部署中通过构造带遍历负载的备份下载请求访问其他站点的备份文件。以下版本受到影响：2026.1.0-latest版本至2026.1.4之前版本、2026.3.0-latest版本至2026.3.1之前版本和2026.4.0-latest版本至2026.4.1之前版本。
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

VendorProductAffected VersionsCPESubscribe
discoursediscourse >= 2026.1.0-latest, < 2026.1.4 -

II. Public POCs for CVE-2026-45775

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III. Intelligence Information for CVE-2026-45775

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Vendor Advisories for CVE-2026-45775 (1)

Same Patch Batch · discourse · 2026-06-12 · 11 CVEs total

CVE-2026-447867.5 HIGHDiscourse: Public chat MessageBus broadcasts are not restricted to chat-eligible users
CVE-2026-447846.5 MEDIUMDiscourse: Non-staff group owners can see email password in plaintext through group histor
CVE-2026-447835.4 MEDIUMDiscourse: Replying to a whisper lets non-whisperers create staff-only whisper posts
CVE-2026-450855.3 MEDIUMDiscourse: Chat misauthorization and information disclosure
CVE-2026-472645.3 MEDIUMDiscourse: Don't leak restricted tag group names via tag info
CVE-2026-472634.3 MEDIUMDiscourse: Prevent webhook payload disclosure on event redelivery
CVE-2026-447794.3 MEDIUMDiscourse: Bot debug endpoints disclose whisper translation audit logs
CVE-2026-447804.3 MEDIUMDiscourse: Category queue reviewers can read raw incoming emails from queued posts
CVE-2026-447824.3 MEDIUMDiscourse: GroupPostSerializer leaks hidden full names through reaction post association
CVE-2026-447854.3 MEDIUMDiscourse: Hidden reply-to post raw can be disclosed through AI explain prompts

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-22

V. Comments for CVE-2026-45775

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