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Fencer Vulns
medium 5.3

CVE-2026-38978 json

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

published 2026-06-02 5 mo ago modified 2026-07-22 3 mo ago also EUVD-2026-33971

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

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

Patch / fix

  • transmission Debian 13 4.1.0~beta2+dfsg-3+deb13u2
  • transmission Debian 14 4.1.2+dfsg-1

debian advisories DEBIAN-CVE-2026-38978

  • transmission Ubuntu 22.04 LTS 3.00-2ubuntu2.2
  • transmission Ubuntu 24.04 LTS 4.0.5-1ubuntu0.1
  • transmission Ubuntu 25.10 4.1.0~beta2+dfsg-3ubuntu1.1
  • transmission Ubuntu 26.04 LTS 4.1.1+dfsg-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-38978

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • transmission openSUSE Leap 16.0 4.0.6-bp160.2.1

opensuse advisories openSUSE-SU-2026:21189-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-38978 updated cvss 5.4

transmission: Transmission: Clickjacking weakness in WebUI and RPC response paths

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/transmission/transmission/issues/8726 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Classification

Weakness
  • CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.