CVE-2026-39915

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.

CVSS 4.0

8.5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-25)

CWE

CWE-113

Published

2026-08-24

Modified

2026-10-12

Record from

the NVD, synced 2026-10-19

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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