CVE-2026-75583
Last modified
CVE-2026-75583 is a low-severity vulnerability rated 3.5/10 on the CVSS scale. keeper.sh's calendar module version prior to 2.18.14 contains a server-side request forgery (SSRF) guard bypass vulnerability that allows authenticated attackers to reach private network addresses by exploiting a DNS rebinding attack against the two-phase URL validation and connection flow. The SSRF guard validates a hostname's resolved IP addresses but discards them before the actual HTTP connection is opened, allowing an attacker who controls authoritative DNS to return a public address during validation and a private address during the subsequent independent socket-level DNS resolution, causing the guard to pass while the outbound connection reaches internal infrastructure such as cloud instance metadata endpoints..
Description
keeper.sh's calendar module version prior to 2.18.14 contains a server-side request forgery (SSRF) guard bypass vulnerability that allows authenticated attackers to reach private network addresses by exploiting a DNS rebinding attack against the two-phase URL validation and connection flow. The SSRF guard validates a hostname's resolved IP addresses but discards them before the actual HTTP connection is opened, allowing an attacker who controls authoritative DNS to return a public address during validation and a private address during the subsequent independent socket-level DNS resolution, causing the guard to pass while the outbound connection reaches internal infrastructure such as cloud instance metadata endpoints.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| ridafkih | keeper.sh | < 2.18.14 |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-75583?
How severe is CVE-2026-75583?
How do I fix CVE-2026-75583?
How Strix Helps
- One Click Account Takeover in GranolaHow a notification link broke out of Electron and led to a one-click account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-75569A flaw was found in mce-operator-bundle. The build process f…7.7
- CVE-2026-7557An improper verification of cryptographic signature vulnerab…9.1
- CVE-2026-75573In MongoDB Connector for BI, mongodrdl may write a TLS priva…4.4
- CVE-2026-75574The Grav Email plugin (getgrav/grav-plugin-email) before 4.2…8.8
- CVE-2026-75575Rocket.Chat exposes the sendForgotPasswordEmail Meteor metho…5.3
- CVE-2026-7558The Age Verification & Identity Verification by Token of Tru…5.3
- CVE-2026-75586The Unlimited Elements For Elementor plugin for WordPress is…6.1
- CVE-2026-75587Mattermost Desktop App versions <=6.2 6.2.2.0 fail to redact…3.3
- CVE-2026-75589Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HM…7.5
- CVE-2026-7559The Affilia – Affiliate Program & Referral Tracking for Word…4.3
- CVE-2026-75592Kirby is an open-source content management system. Prior to …6.9
- CVE-2026-75593BuildKit is a toolkit for converting source code to build ar…7.2
Are you affected by CVE-2026-75583?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST