Security readout for executives and security teams
Plain-English summary
CVE-2026-1225 affects QOS.CH logback-core in Java applications. If an attacker can already modify an existing logback.xml configuration file, they may cause the application to instantiate classes already on its classpath. The published severity is low because exploitation requires high privileges and specific conditions.
Executive priority
Treat as a low-priority maintenance item unless configuration file integrity is weak. Prioritize normal dependency updates and access-control review rather than emergency response.
Technical view
The issue is an ACE-class weakness in logback-core configuration processing, reported for versions up to and including 1.5.24. A compromised logback configuration can instantiate arbitrary classes present on the application classpath. The CVSS 4.0 score is 1.8, with local access, high complexity, and high privileges required.
Likely exposure
Exposure is mainly Java applications using logback-core where attackers or compromised accounts can write to existing logback configuration files. Systems with tightly controlled configuration files are less likely to be exposed.
Exploitation context
No active exploitation is indicated in the provided sources, and the CVE is not listed as KEV. The attacker must have write access to a configuration file and can only instantiate classes already present on the classpath.
Researcher notes
The practical impact appears constrained: class instantiation requires an existing class on the classpath and a writable configuration file. The source also notes the instantiated object is likely discarded. Evidence is sparse beyond the CVE text and Logback release reference.
Mitigation direction
- Identify Java applications using QOS.CH logback-core.
- Review vendor guidance for the 1.5.25 release referenced by Logback.
- Upgrade according to vendor guidance where applicable.
- Restrict write access to logback configuration files.
- Monitor configuration files for unauthorized changes.
- Reduce unnecessary classes and libraries on application classpaths.
Validation and detection
- Inventory deployed logback-core versions in Java applications.
- Check whether any deployment uses versions up to 1.5.24.
- Verify logback configuration files are not writable by untrusted users.
- Review recent changes to logback.xml or equivalent configuration files.
- Confirm vendor-recommended updates are applied where relevant.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-1225 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 1.8 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
1.8LowVector: CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green
Source materials
- CVE List V5 sourceCVE List V5
- https://logback.qos.ch/news.html#1.5.25CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.