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CVE-2026-44502— Bugsink: SSRF bypass in `validate_webhook_url`

Quick assessment

Affected
bugsink bugsink
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.

Bugsink是Bugsink开源的一个自托管Bug跟踪软件。 Bugsink 2.1.3之前版本存在代码问题漏洞，该漏洞源于URL解析不匹配导致Webhook URL验证可被部分绕过，可能使攻击者绕过验证并连接到不同主机。

CVSS 4.3 · Medium EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
bugsink bugsink < 2.1.3 affected
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I. Basic Information for CVE-2026-44502

Vulnerability Information
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Vulnerability Title
Bugsink: SSRF bypass in `validate_webhook_url`
Source: CVE Program / CVE List V5
Vulnerability Description
Bugsink is a self-hosted error tracking tool. Prior to 2.1.3, Bugsink’s webhook URL validation could be (partially) bypassed because of a mismatch in URL parsing. The original validation logic parsed webhook URLs with Python’s urllib.parse.urlparse, then sent the request with requests.post. For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host. This vulnerability is fixed in 2.1.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Bugsink 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bugsink是Bugsink开源的一个自托管Bug跟踪软件。 Bugsink 2.1.3之前版本存在代码问题漏洞，该漏洞源于URL解析不匹配导致Webhook URL验证可被部分绕过，可能使攻击者绕过验证并连接到不同主机。
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
bugsink bugsink < 2.1.3 -

II. Public POCs for CVE-2026-44502

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III. Intelligence Information for CVE-2026-44502

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Patches & Fixes for CVE-2026-44502 (1)

Vendor Advisories for CVE-2026-44502 (2)

Same Patch Batch · bugsink · 2026-05-26 · 4 CVEs total

CVE-2026-47728 4.3 MEDIUM Bugsink: Project scoping missing in sourcemap and debug-file lookup
CVE-2026-47715 3.1 LOW Bugsink: Issue event views can show an event from another project if its UUID is known
CVE-2026-47716 3.1 LOW Bugsink: Issue bulk actions can affect another project’s issue if its UUID is known

IV. Related Vulnerabilities

Same product: bugsink
Same vendor: bugsink
Same weakness: CWE-918

V. Comments for CVE-2026-44502

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