CVE-2026-38978Public exploitNetwork attack vector

Privileged UI actions via missing anti-framing headers

Published Jun 2, 2026 · Updated Jun 2, 2026

Clickjacking in Transmission 4.1.1 and earlier allows remote attackers to induce privileged WebUI actions through a framed page. libtransmission/rpc-server.cc emits WebUI and RPC responses without X-Frame-Options or a CSP frame-ancestors restriction. An authenticated Transmission user must load and interact with attacker-controlled framed content; the issue does not enable cross-origin reads or bypass CSRF by itself.

CVSS severity5.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in Transmission 4.1.1 and earlier allows remote attackers to induce privileged WebUI actions through a framed page. libtransmission/rpc-server.cc emits WebUI and RPC responses without X-Frame-Options or a CSP frame-ancestors restriction. An authenticated Transmission user must load and interact with attacker-controlled framed content; the issue does not enable cross-origin reads or bypass CSRF by itself.

The record

CVE
CVE-2026-38978
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-113, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
T1204User Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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