CyberSecBulletin
CVE-2025-41429NVD status: Analyzed

a-blog cms: Improper Output Neutralization for Logs

Published Updated By the CyberSecBulletin desk

CVE-2025-41429 is a critical-severity improper output neutralization for logs vulnerability in a-blog cms from Appleple, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected a-blog cms versions: Ver. 2.8.85 and earlier (Ver. 2.8.x series); Ver. 3.1.43 and earlier (Ver. 3.1.x series); Ver. 3.0.47 and earlier (Ver. 3.0.x series), and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.4% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of a-blog cms you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on developer.a-blogcms.jp for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Appleplea-blog cmsVer. 2.8.85 and earlier (Ver. 2.8.x series); Ver. 3.1.43 and earlier (Ver. 3.1.x series); Ver. 3.0.47 and earlier (Ver. 3.0.x series); Ver. 2.11.75 and earlier (Ver. 2.11.x series); Ver. 2.10.63 and earlier (Ver. 2.10.x series); Ver. 2.9.52 and earlier (Ver. 2.9.x series)Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 4.02.1LowCNA (jpcert.or.jp)
CVSS 3.14.8MediumCNA (jpcert.or.jp)
CVSS 3.19.8CriticalNVD

Official description

a-blog cms multiple versions neutralize logs improperly. If this vulnerability is exploited with CVE-2025-36560, a remote unauthenticated attacker may hijack a legitimate user's session.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Output Neutralization for Logs

The product constructs a log message from external input, but it does not neutralize or incorrectly neutralizes special elements when the message is written to a log file.

How developers prevent this class of flaw

  • Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

More Improper Output Neutralization for Logs vulnerabilities (CWE-117)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in a-blog cms

All a-blog cms vulnerabilities

Recent Improper Output Neutralization for Logs vulnerabilities

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