CVE-2026-39915 TIM Flow < 26.0.6 CRLF Injection via rt Parameter
Remote attackers can inject HTTP headers via the rt parameter to execute JavaScript, steal sessions, and modify credentials in TIM Flow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-39915?
CVE-2026-39915 is a high-severity cross-site scripting vulnerability in TIM Flow, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-113
Which versions are affected by CVE-2026-39915?
How do I fix CVE-2026-39915?
No fix has been published for CVE-2026-39915 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-39915 being exploited?
There is no known exploitation of CVE-2026-39915 in the wild and no public exploit code.
Sources
Also known as GHSA-whrv-mf4r-37rq.