CVE-2025-68934— Discourse Has Denial of Service (DoS) Vulnerability in Drafts Creation Endpoint
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 3.5.4之前版本、2025.11.2之前版本、2025.12.1之前版本和2026.1.0之前版本存在安全漏洞，该漏洞源于经过身份验证的用户可以向/drafts.json提交特制有效载荷，导致Base62.decode进行O(n^2)处理，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2025-68934
Vulnerability Information
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Vulnerability Title
Discourse Has Denial of Service (DoS) Vulnerability in Drafts Creation Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, authenticated users can submit crafted payloads to /drafts.json that cause O(n^2) processing in Base62.decode, tying up workers for 35-60 seconds per request. This affects all users as the shared worker pool becomes exhausted. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Lowering the max_draft_length site setting reduces attack surface but does not fully mitigate the issue, as payloads under the limit can still trigger the slow code path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse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 3.5.4之前版本、2025.11.2之前版本、2025.12.1之前版本和2026.1.0之前版本存在安全漏洞，该漏洞源于经过身份验证的用户可以向/drafts.json提交特制有效载荷，导致Base62.decode进行O(n^2)处理，可能导致拒绝服务攻击。
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
II. Public POCs for CVE-2025-68934
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · discourse · 2026-01-28 · 14 CVEs total
| CVE-2025-68662 | 7.6 HIGH | FinalDestination hostname matching allows SSRF protection bypass |
| CVE-2025-68479 | 7.1 HIGH | Discourse subscriptions are susceptible to takeover |
| CVE-2025-68933 | 6.9 MEDIUM | Discourse non-admin moderators can exfiltrate private content via post ownership transfer |
| CVE-2026-24742 | 6.5 MEDIUM | Discourse staff action logs expose sensitive information to moderators |
| CVE-2026-21865 | 6.5 MEDIUM | Discourse topic conversion permission vulnerability for moderators |
| CVE-2025-67723 | 4.6 MEDIUM | Discourse vulnerable to stored Cross-site Scripting via Katex in discourse-math plugin |
| CVE-2025-66488 | 4.6 MEDIUM | Discourse allows script execution in uploaded HTML/XML files on S3 |
| CVE-2025-68659 | 4.3 MEDIUM | Discourse has DoS vulnerability in username change endpoint |
| CVE-2026-23743 | Discourse allows permalinks to restricted resources to leak resource slugs to unauthorized | |
| CVE-2025-69289 | Discourse has insecure default configuration that allows non-admin moderators to takeover | |
| CVE-2025-69218 | Discourse moderators can access admin-only reports exposing private upload URLs | |
| CVE-2025-68666 | Discourse users archives leaked to users with moderation privileges | |
| CVE-2025-68660 | Discourse AI Discover's continue conversation allows threat actor to impersonate user |
IV. Related Vulnerabilities
Same product: discourse
-
CVE-2026-53960
Discourse: Hidden first-post excerpt is emitted in Q&A schem -
CVE-2026-55704
Discourse: Shared-draft titles and excerpts leak through gro -
CVE-2026-55674
Discourse: Cache poisoning/XSS via color scheme cookies -
CVE-2026-59829
Discourse: Review queue exposes flag-related private message -
CVE-2026-72732
Discourse: Templates endpoint exposes hidden tag names
Same vendor: discourse
-
CVE-2026-53960
Discourse: Hidden first-post excerpt is emitted in Q&A schem -
CVE-2026-55704
Discourse: Shared-draft titles and excerpts leak through gro -
CVE-2026-55674
Discourse: Cache poisoning/XSS via color scheme cookies -
CVE-2026-59829
Discourse: Review queue exposes flag-related private message -
CVE-2026-72732
Discourse: Templates endpoint exposes hidden tag names
Same weakness: CWE-770
-
CVE-2026-55620
eml_parser: DoS via deeply nested parens in Received headers -
CVE-2026-55619
eml_parser: Parser DoS via deeply nested parentheses in e-ma -
CVE-2026-63075
QUIC ACK-only Packet Retention Can Cause Memory Exhaustion -
CVE-2026-63074
CMP Indefinite Cache Growth of ExtraCerts -
CVE-2026-79661
Ech0 before 4.7.3 Unauthenticated fav_count Modification
V. Comments for CVE-2025-68934
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