What’s Vulnerable › Vulnerabilities

CVE-2026-39915: TIM Flow < 26.0.6 CRLF Injection via rt Parameter

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-12
• Weakness: CWE-113

Description

TIM Flow before 26.0.6 contains a CRLF injection vulnerability that allows remote attackers to inject arbitrary HTTP headers and response body content by embedding unsanitized carriage return and line feed sequences in the rt URL parameter, which is reflected into Set-Cookie response headers. Attackers can craft malicious requests to induce authenticated users to execute arbitrary JavaScript in their browser context, enabling session token theft and account credential modification.

Affected products

• TIM Solutions TIM Flow: before 26.0.6 — fixed in 26.0.6

How to fix

Upgrade to a fixed version: TIM Solutions TIM Flow 26.0.6. Check the vendor advisory for mitigations.

References

• https://tim-doc.atlassian.net/wiki/spaces/eng/pages/230981636/Release+Notes
• https://www.vulncheck.com/advisories/tim-flow-crlf-injection-via-rt-parameter

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