Security readout for executives and security teams
Plain-English summary
Firefly III versions before 4.7.17.3 can store malicious JavaScript in image filenames. That script runs when an attachment is edited, potentially affecting an authenticated user viewing that edit screen. The sources state the attacker needs the same access rights as the user, which limits but does not remove business risk.
Executive priority
Schedule remediation through normal vulnerability management unless the instance is internet-accessible, multi-user, or handles sensitive financial data. Escalate if untrusted users can upload attachments.
Technical view
CVE-2019-13645 is a stored cross-site scripting issue in Firefly III caused by insufficient filtering of user-supplied image filenames. Execution occurs in the attachment edit path for a file ID. Public metadata names versions before 4.7.17.3 and links to a GitHub issue and code comparison, but provides no CVSS vector or CWE.
Likely exposure
Exposure is likely limited to organizations running Firefly III before 4.7.17.3 with users who can upload or edit image attachments. No CPEs or detailed affected product matrix were provided.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The CVE note says an attacker must have the same access rights as the user to execute the vulnerability.
Researcher notes
Evidence is narrow but specific: stored XSS through image filenames, triggered during attachment editing. The record lacks CVSS, CWE, CPEs, and exploitation evidence, so validation should focus on version, attachment workflows, and user permission boundaries.
Mitigation direction
- Upgrade Firefly III to version 4.7.17.3 or later.
- Restrict attachment editing to trusted authenticated users until upgraded.
- Review the linked vendor issue and code comparison for vendor-specific guidance.
- Treat uploaded filenames as untrusted data in related controls.
Validation and detection
- Inventory Firefly III deployments and record their versions.
- Flag any instance running below 4.7.17.3.
- Review attachment permissions for unnecessary upload or edit access.
- Check logs for unexpected attachment editing activity.
- Confirm remediation using vendor release or commit evidence.
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
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CVE-2019-13645 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/firefly-iii/firefly-iii/issues/2337CVE reference · x_refsource_MISC
- https://github.com/firefly-iii/firefly-iii/compare/a70b7cc...7d482aaCVE reference · x_refsource_MISC
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.