Authenticated SSRF via unrestricted Markdown image fetching
Published Sep 11, 2026 · Updated Sep 11, 2026
Server-side request forgery in Kimai before 2.58.0 allows remote authenticated users to probe internal services through invoice PDF rendering. The invoice pipeline converts Customer.invoiceText Markdown to HTML and gives it to mPDF, which fetches image URLs without restricting destination addresses. Exploitation requires permission to edit customer invoice text and create invoices, privileges typically limited to administrators; resulting requests can reach internal services or attacker-controlled hosts.
Summary
What happened
Server-side request forgery in Kimai before 2.58.0 allows remote authenticated users to probe internal services through invoice PDF rendering. The invoice pipeline converts Customer.invoiceText Markdown to HTML and gives it to mPDF, which fetches image URLs without restricting destination addresses. Exploitation requires permission to edit customer invoice text and create invoices, privileges typically limited to administrators; resulting requests can reach internal services or attacker-controlled hosts.
The record
- CVE
- CVE-2026-49865
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- Kimai
- Product
- Kimai
- Classifications
- CWE-918, T1046
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 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?
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- Affected versionversion=< 2.58.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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