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

Quick assessment

Affected
discourse discourse
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.

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。

CVSS 6.8 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
discourse discourse >= 2026.1.0-latest, < 2026.1.4 affected
>= 2026.3.0-latest, < 2026.3.1 affected
>= 2026.4.0-latest, < 2026.4.1 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
discourse discourse >= 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-2026-44786 7.5 HIGH Discourse: Public chat MessageBus broadcasts are not restricted to chat-eligible users
CVE-2026-44784 6.5 MEDIUM Discourse: Non-staff group owners can see email password in plaintext through group histor
CVE-2026-44783 5.4 MEDIUM Discourse: Replying to a whisper lets non-whisperers create staff-only whisper posts
CVE-2026-45085 5.3 MEDIUM Discourse: Chat misauthorization and information disclosure
CVE-2026-47264 5.3 MEDIUM Discourse: Don't leak restricted tag group names via tag info
CVE-2026-47263 4.3 MEDIUM Discourse: Prevent webhook payload disclosure on event redelivery
CVE-2026-44779 4.3 MEDIUM Discourse: Bot debug endpoints disclose whisper translation audit logs
CVE-2026-44780 4.3 MEDIUM Discourse: Category queue reviewers can read raw incoming emails from queued posts
CVE-2026-44782 4.3 MEDIUM Discourse: GroupPostSerializer leaks hidden full names through reaction post association
CVE-2026-44785 4.3 MEDIUM Discourse: 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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