CVE-2026-44502Network attack vector

Authenticated SSRF via divergent webhook URL parsing

Published May 26, 2026 · Updated May 26, 2026

SSRF in webhook URL validation in Bugsink before 2.1.3 allows remote authenticated users to send HTTP POST requests to blocked hosts. The validate_webhook_url function parsed the target with urllib.parse.urlparse, but requests.post interpreted crafted backslashes and @ signs differently when selecting the actual host. A user able to configure or influence a webhook URL can reach loopback, private, or non-allowlisted destinations, but cannot use the flaw as a general-purpose proxy.

CVSS severity4.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in webhook URL validation in Bugsink before 2.1.3 allows remote authenticated users to send HTTP POST requests to blocked hosts. The validate_webhook_url function parsed the target with urllib.parse.urlparse, but requests.post interpreted crafted backslashes and @ signs differently when selecting the actual host. A user able to configure or influence a webhook URL can reach loopback, private, or non-allowlisted destinations, but cannot use the flaw as a general-purpose proxy.

The record

CVE
CVE-2026-44502
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Bugsink
Product
Bugsink
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Bugsink · Bugsinkversion=< 2.1.3

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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