Security readout for executives and security teams
Plain-English summary
LocalSend versions up to 1.17.0 can display shared file names unsafely in the “Share via Link” web page. A maliciously named file could run script in another user’s browser when they view the share page. This is a medium-severity issue requiring user interaction and local sharing context.
Executive priority
Treat as a routine but prompt desktop application update. Business risk is moderate because exploitation needs user interaction and a specific sharing workflow, but successful abuse could affect trust in internal file-sharing sessions.
Technical view
CVE-2026-25154 is a stored cross-site scripting issue in LocalSend’s web share interface. The vulnerable client-side file listing logic in app/assets/web/main.js builds HTML from filenames received from the server. CVSS is 6.1: network-reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
Exposure is limited to LocalSend deployments or endpoints running versions <= 1.17.0 and using “Share via Link.” Risk depends on whether users receive or host files with untrusted filenames and whether other users open the generated local web share page.
Exploitation context
The provided sources do not report active exploitation, and this CVE is not marked KEV. Exploitation requires a crafted filename and a user viewing the affected share interface. Impact is browser-side script execution in the context of the LocalSend web share page.
Researcher notes
The source bundle identifies CWE-79 and affected versions <= 1.17.0. It names the patched commit but does not provide a fixed version number. Avoid assuming internet-wide exposure because LocalSend is intended for nearby local-network sharing.
Mitigation direction
- Identify LocalSend installations running version 1.17.0 or earlier.
- Apply a vendor-supported release that includes commit 8f3cec85aa29b2b13fed9b2f8e499e1ac9b0504c.
- If no fixed release is available, follow LocalSend advisory guidance.
- Avoid using “Share via Link” with untrusted filenames until patched.
Validation and detection
- Check installed LocalSend versions across managed endpoints.
- Confirm the deployed build includes the referenced patch commit.
- Review whether users rely on “Share via Link” workflows.
- Monitor vendor advisory updates for fixed release details.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-25154 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
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/localsend/localsend/security/advisories/GHSA-34v6-52hh-x4r4CVE reference · x_refsource_CONFIRM
- https://github.com/localsend/localsend/commit/8f3cec85aa29b2b13fed9b2f8e499e1ac9b0504cCVE 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.