Missing authorization in xianyu-auto-reply-fix allows message sending
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
xianyu-auto-reply-fix through 2.0.7 contains a missing authorization check in the POST /send-message endpoint. An unauthenticated remote attacker can send Xianyu messages from another user's account to that merchant's buyers by using the publicly known default API secret. The flaw stems from an insecure default configuration (CWE-1188).
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
xianyu-auto-reply-fix through 2.0.7 contains a missing authorization vulnerability in the POST /send-message endpoint that allows unauthenticated attackers to send messages from other users' accounts using publicly known default API secrets. Attackers can supply the hard-coded api_key and another user's cookie_id, plus chosen chat_id, to_user_id and message values, to send arbitrary Xianyu messages to buyers from that merchant account.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| GuDong2003 | xianyu-auto-reply-fix | up to 2.0.7 | — | No fix listed | CNA |
- xianyu-auto-reply-fix VendorGuDong2003 Affected up to 2.0.7 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for xianyu-auto-reply-fix.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-10-28 Threatist record created from CVE-2026-118691
- 2026-10-29 Alias added: GHSA-8xg3-rxxw-rm99
- 2026-10-30 Priority changed: MEDIUM → LOW
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Priority changed: LOW → MEDIUM
References
Patch 1
Sources
- CVE-2026-118691 · CVE Program
- CVE-2026-118691 · NVD
- FIRST EPSS
- GHSA-8xg3-rxxw-rm99 · GitHub Advisory Database · CC BY 4.0
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