CVE-2026-58266Network attack vector

Arbitrary file disclosure via unsandboxed iframe scripts

Published Jul 7, 2026 · Updated Jul 7, 2026

Origin validation failure in Anki before 25.09.4 allows remote attackers to read local files through a malicious imported card package. The media server applies an insufficient content security policy to untrusted HTML or SVG, allowing iframe scripts to call localhost API methods such as getImageForOcclusion. Exploitation requires a desktop user to import an untrusted .apkg and view its embedded iframe; the script can exfiltrate files readable by Anki but cannot modify them.

CVSS severity6.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation failure in Anki before 25.09.4 allows remote attackers to read local files through a malicious imported card package. The media server applies an insufficient content security policy to untrusted HTML or SVG, allowing iframe scripts to call localhost API methods such as getImageForOcclusion. Exploitation requires a desktop user to import an untrusted .apkg and view its embedded iframe; the script can exfiltrate files readable by Anki but cannot modify them.

The record

CVE
CVE-2026-58266
Published
Jul 7, 2026
Updated
Jul 7, 2026
Vendor
Ankitects Pty Ltd
Product
Anki
Classifications
CWE-346, T1204.002, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 25.09.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ankitects Pty Ltd · Ankiversion=< 25.09.4

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1204.002Malicious File
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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