Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-18738— Shlink CSV Formula Injection via Visit Export CLI

Quick assessment

Affected
shlinkio Shlink
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.

shlinkio Shlink是shlinkio组织的一款URL缩短工具。 shlinkio Shlink 5.0.0版本至5.1.5版本存在输入验证错误漏洞，该漏洞源于对User-Agent、Referer或请求路径标头中的输入验证不足，可能导致CSV公式注入攻击。

CVSS 4.7 · Medium EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
shlinkio Shlink 5.0.0≤ 5.1.5 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-18738

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Shlink CSV Formula Injection via Visit Export CLI
Source: CVE Program / CVE List V5
Vulnerability Description
Shlink versions 5.0.0 through 5.1.5 contain a CSV formula injection vulnerability that allows unauthenticated remote attackers to plant spreadsheet formulas into exported visit data by supplying malicious values in User-Agent, Referer, or request path headers beginning with formula-triggering characters such as =, +, -, or @. Attackers can craft a single unauthenticated request against any short URL to embed DDE or WEBSERVICE formula payloads into CSV cells, which are then executed on an administrator's client machine when the exported CSV file is opened in a spreadsheet application that evaluates formulas.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1236
Source: CVE Program / CVE List V5
Vulnerability Title
shlinkio Shlink 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
shlinkio Shlink是shlinkio组织的一款URL缩短工具。 shlinkio Shlink 5.0.0版本至5.1.5版本存在输入验证错误漏洞，该漏洞源于对User-Agent、Referer或请求路径标头中的输入验证不足，可能导致CSV公式注入攻击。
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

Vendor Product Affected Versions CPE Subscribe
shlinkio Shlink 5.0.0 ~ 5.1.5 -

II. Public POCs for CVE-2026-18738

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-18738

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-18738 (1)

Proof of Concept for CVE-2026-18738 (1)

Other References for CVE-2026-18738 (1)

Same Patch Batch · shlinkio · 2026-08-03 · 3 CVEs total

CVE-2026-18737 6.5 MEDIUM Shlink Blind SQL Injection via tags/stats orderBy Parameter
CVE-2026-18736 5.0 MEDIUM Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution

IV. Related Vulnerabilities

Same product: Shlink
Same vendor: shlinkio
Same weakness: CWE-1236

V. Comments for CVE-2026-18738

No comments yet

Leave a comment