Vulnerability in Tim Solutions Flow
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- tim-doc.atlassian.net/wiki/spaces/eng/pages/230981636/Release+Notes (release-notes)
- www.vulncheck.com/advisories/tim-flow-crlf-injection-via-rt-parameter-and-acces… (third-party-advisory)
- www.vulncheck.com/advisories/tim-flow-crlf-injection-via-rt-parameter (third-party-advisory)
Frequently asked questions
- What is CVE-2026-39915?
- CVE-2026-39915 is a high-severity vulnerability in Tim Solutions Flow, classified under HTTP Response Splitting. CVSS score: 8.1/10. Published 2026-08-24.
- How severe is CVE-2026-39915?
- High severity. CVSS v3 base score is 8.1 out of 10.