How severe is CVE-2026-38978?

CVE-2026-38978 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-38978 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-38978?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-38978 have an EU (EUVD) identifier?

Yes. CVE-2026-38978 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33971.

When was CVE-2026-38978 published?

CVE-2026-38978 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-38978

CVE-2026-38978 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-113.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33971
Weakness: CWE-113
Published: 2026-06-02
Last modified: 2026-06-17

Description

transmission through 4.1.1 was found to have a clickjacking weakness in the browser-facing WebUI and RPC response paths.

Frequently asked questions

What is CVE-2026-38978?: transmission through 4.1.1 was found to have a clickjacking weakness in the browser-facing WebUI and RPC response paths.
How severe is CVE-2026-38978?: CVE-2026-38978 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-38978 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-38978?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-38978 have an EU (EUVD) identifier?: Yes. CVE-2026-38978 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33971.
When was CVE-2026-38978 published?: CVE-2026-38978 was published on 2026-06-02 and last updated on 2026-06-17.

References

Other CWE-113 (HTTP Response Splitting) vulnerabilities

CVE-2026-38967 — Critical (CVSS 9.8): CrowCpp Crow through v1.3.1 HTTP is vulnerable to response header injection via unvalidated response header values.
CVE-2026-34520 — Critical (CVSS 9.1): AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser…
CVE-2025-53007 — High (CVSS 8.9): arduino-esp32 provides an Arduino core for the ESP32. Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response…
CVE-2024-52875 — High (CVSS 8.8): An issue was discovered in GFI Kerio Control 9.2.5 through 9.4.5. The dest GET parameter passed to the…
CVE-2018-0689 — High (CVSS 8.8): HTTP header injection vulnerability in SEIKO EPSON printers and scanners (DS-570W firmware versions released prior to…
CVE-2018-11347 — High (CVSS 8.8): The YunoHost 2.7.2 through 2.7.14 web application is affected by one HTTP Response Header Injection. This flaw allows…

Browse all CWE-113 (HTTP Response Splitting) vulnerabilities →